This document discusses biodiversity, including its definition, levels (genetic, species, ecological), global biodiversity statistics, and threats. It also covers measurement of biodiversity, importance of species diversity, causes of biodiversity loss like habitat loss and fragmentation, overexploitation, invasive species, and co-extinction. Examples of endemic species, biological hotspots, threatened species categories, and approaches to conservation like in-situ and ex-situ are provided.
The document discusses key concepts related to ecosystems, including:
- Ecosystems are functional units where living organisms interact with each other and the physical environment. They can be artificial or natural.
- Energy flows through ecosystems via food chains and is lost at each trophic level, while nutrients cycle through ecosystems via decomposition.
- Ecosystems provide important services like carbon storage, water purification, soil formation, and cultural/aesthetic values.
Chapter 5 principles of inheritance and variationmohan bio
- Mendelian genetics deals with the study of heredity and variation through experiments in pea plants by Gregor Mendel.
- Mendel discovered the laws of inheritance through experiments showing traits are inherited in dominant and recessive patterns.
- His work was later combined with the chromosomal theory of inheritance which showed genes are located on chromosomes and segregate during gamete formation according to Mendel's laws.
This document discusses biotechnology and genetic engineering techniques. It explains that biotechnology uses organisms or enzymes to produce useful products. Genetic engineering techniques allow modification of genetic material like DNA and RNA to change host organism phenotypes. Key techniques include identifying genes of interest, introducing them into hosts, and maintaining the introduced DNA in progeny. Restriction enzymes and vectors are important tools that allow cutting and recombining of DNA to clone genes and transfer them to target organisms.
Chapter 13 ecology:organism and population. 2014 by mohanbiomohan bio
This document discusses ecology and the levels of organization in ecology from organisms to biomes. It describes abiotic factors like temperature, water, light and soil that influence organisms and biomes. It also discusses biotic factors like pathogens and predators. Several biomes are described that are formed based on annual temperature and precipitation variations. The document discusses population attributes, growth models, life history variations, and population interactions like competition, predation, parasitism, commensalism and mutualism. Adaptations of organisms to the environment are also summarized.
This document discusses ecology and the relationship between organisms and their environment. It covers levels of ecological organization like populations, communities, and biomes. It also discusses abiotic factors like temperature, water, light, and soil that influence organisms and how organisms adapt to different environments through mechanisms like homeostasis, regulation, migration, dormancy, and behavioral and physiological adaptations.
Molecular basis of inheritance by mohanbiomohan bio
Nucleic acids are macromolecules found in all living cells that carry genetic information. Friedrich Miescher first isolated nucleic acids from white blood cells in 1869. There are two main types of nucleic acids: DNA and RNA. DNA is the genetic material found in the nuclei of cells and in organelles like mitochondria. It has a double-helix structure formed by pairing of nitrogenous bases. RNA is also found in cells and is involved in protein synthesis. The flow of genetic information goes from DNA to RNA to protein, as described by the central dogma of molecular biology.
The document summarizes the origin and evolution of life on Earth. It describes how the Big Bang led to the formation of the universe and early Earth. The first life forms were single-celled organisms that evolved into more complex multicellular life over billions of years, including early humans. Key events were the origin of eukaryotic cells, emergence of land plants and animals, dinosaur extinction, early human ancestors like Homo habilis and Homo erectus, and modern Homo sapiens developing around 200,000 years ago.
The document discusses key concepts related to ecosystems, including:
- Ecosystems are functional units where living organisms interact with each other and the physical environment. They can be artificial or natural.
- Energy flows through ecosystems via food chains and is lost at each trophic level, while nutrients cycle through ecosystems via decomposition.
- Ecosystems provide important services like carbon storage, water purification, soil formation, and cultural/aesthetic values.
Chapter 5 principles of inheritance and variationmohan bio
- Mendelian genetics deals with the study of heredity and variation through experiments in pea plants by Gregor Mendel.
- Mendel discovered the laws of inheritance through experiments showing traits are inherited in dominant and recessive patterns.
- His work was later combined with the chromosomal theory of inheritance which showed genes are located on chromosomes and segregate during gamete formation according to Mendel's laws.
This document discusses biotechnology and genetic engineering techniques. It explains that biotechnology uses organisms or enzymes to produce useful products. Genetic engineering techniques allow modification of genetic material like DNA and RNA to change host organism phenotypes. Key techniques include identifying genes of interest, introducing them into hosts, and maintaining the introduced DNA in progeny. Restriction enzymes and vectors are important tools that allow cutting and recombining of DNA to clone genes and transfer them to target organisms.
Chapter 13 ecology:organism and population. 2014 by mohanbiomohan bio
This document discusses ecology and the levels of organization in ecology from organisms to biomes. It describes abiotic factors like temperature, water, light and soil that influence organisms and biomes. It also discusses biotic factors like pathogens and predators. Several biomes are described that are formed based on annual temperature and precipitation variations. The document discusses population attributes, growth models, life history variations, and population interactions like competition, predation, parasitism, commensalism and mutualism. Adaptations of organisms to the environment are also summarized.
This document discusses ecology and the relationship between organisms and their environment. It covers levels of ecological organization like populations, communities, and biomes. It also discusses abiotic factors like temperature, water, light, and soil that influence organisms and how organisms adapt to different environments through mechanisms like homeostasis, regulation, migration, dormancy, and behavioral and physiological adaptations.
Molecular basis of inheritance by mohanbiomohan bio
Nucleic acids are macromolecules found in all living cells that carry genetic information. Friedrich Miescher first isolated nucleic acids from white blood cells in 1869. There are two main types of nucleic acids: DNA and RNA. DNA is the genetic material found in the nuclei of cells and in organelles like mitochondria. It has a double-helix structure formed by pairing of nitrogenous bases. RNA is also found in cells and is involved in protein synthesis. The flow of genetic information goes from DNA to RNA to protein, as described by the central dogma of molecular biology.
The document summarizes the origin and evolution of life on Earth. It describes how the Big Bang led to the formation of the universe and early Earth. The first life forms were single-celled organisms that evolved into more complex multicellular life over billions of years, including early humans. Key events were the origin of eukaryotic cells, emergence of land plants and animals, dinosaur extinction, early human ancestors like Homo habilis and Homo erectus, and modern Homo sapiens developing around 200,000 years ago.
1. Nucleic acids DNA and RNA act as genetic material in living organisms, with DNA serving as the primary genetic material that is faithfully copied and passed on to offspring.
2. Early experiments established that DNA, not protein, was the genetic material through transformation and infection experiments.
3. DNA was shown to be stable and able to replicate, with base-pairing allowing for the duplication of genetic information. While RNA also replicates, it is less stable than DNA due to its structure.
Ch 15 - Biodiversity and Conservation || Class 12 ||SAQIB AHMED
Biodiversity refers to the variety of plant and animal life on Earth. It includes genetic diversity within species, diversity of species, and diversity of ecosystems. Maintaining biodiversity is important because all species are interconnected and play vital roles in ecosystems. The major threats to biodiversity are habitat loss, overexploitation, invasive species, and coextinctions. At current extinction rates, half of all species may be lost within 100 years, constituting a human-caused sixth mass extinction.
Chapter 6. Molecular basis of inheritance.mohan bio
Nucleic acids like DNA and RNA are the genetic material found in living cells. DNA carries genetic information from one generation to the next and is made up of deoxyribose, phosphate groups, and nitrogenous bases. DNA replication is semi-conservative and produces two identical DNA molecules, each with one old and one new strand. Transcription produces mRNA from a DNA template, and translation reads mRNA to produce proteins according to the central dogma of biology.
Evolution is the process of change over generations in the inherited characteristics of biological populations. There are several key points in the origin and evolution of life on Earth according to the document:
1) The universe is approximately 13.8 billion years old. The Earth formed 4.5 billion years ago from gases and dust particles in the solar system.
2) Early theories for the origin of life included special creation by God, panspermia (life originating from space), and spontaneous generation from non-living matter. However, the accepted theory today is chemical evolution - that first life arose gradually from organic molecules on the early Earth.
3) Evidence from fossils, embryology, comparative anatomy and molecular studies supports the theory
This document discusses different levels of ecological organization and biotic and abiotic factors that influence organisms and populations. It covers key topics like:
1. The six levels of ecological organization from organisms to biomes.
2. Major abiotic factors like temperature, water, light, and soil that influence organisms and biotic factors like predators and parasites.
3. How organisms respond and adapt to environmental conditions through processes like thermoregulation, migration, suspension, and adaptation.
4. Attributes of populations like birth rate, death rate, population growth models, and types of population interactions like predation, competition, and parasitism.
Principles of Inheritance, Class 12 CBSEblessiemary
This document provides information about principles of inheritance and variation in genetics. It discusses key topics including:
- Genetics deals with inheritance and variation from parents to offspring. Variation results in offspring differing from parents.
- Gregor Mendel conducted experiments with pea plants in the 1800s and established the principles of heredity, including dominance, segregation, independent assortment. He demonstrated genes are passed from parents to offspring in predictable ratios.
- Chromosomal theory of inheritance later explained that genes are located on chromosomes and segregate during gamete formation according to Mendel's laws. The work of Morgan, Sutton, and Boveri supported this theory through experimentation.
Chapter 16.environmental issues by mohanbiomohan bio
The document discusses various types of pollution including air, water, soil, and radiation pollution. It provides details on the causes and effects of air pollution, describing major air pollutants such as oxides of sulfur and nitrogen. Methods to control air pollution are also outlined, such as electrostatic precipitators and catalytic converters. Water pollution and its effects on biodiversity are then examined, followed by information on other environmental issues like greenhouse effect, global warming, ozone layer depletion, and different forms of waste.
This document discusses biotechnology and recombinant DNA technology. It defines biotechnology as using organisms or enzymes to produce useful products. It explains the principles of genetic engineering and maintaining sterile environments. It also describes the basic tools used in recombinant DNA technology, including restriction endonucleases, cloning vectors, competent host cells. Finally, it outlines the processes involved in recombinant DNA technology such as isolating genetic material, inserting DNA into host cells, and using bioreactors to produce products at large scale.
Biological classification involves the study and organization of organisms into a hierarchy of groups and taxa based on their evolutionary relationships and distinguishing characteristics. The main goals are to identify all organisms and determine their evolutionary history. Carl Linnaeus developed the binomial naming system in the 1700s that is still used today. There are several systems that have been proposed to classify life, with newer systems incorporating molecular evidence to revise the evolutionary relationships between domains, kingdoms, and taxa. Prokaryotes like bacteria and archaea are classified based on characteristics like shape, metabolism, and environment. Eukaryotes like protists, fungi, plants and animals are organized into domains, kingdoms and smaller taxa.
This document provides an overview of the key concepts and theories related to evolutionary biology. It discusses the origin of life on Earth, the early conditions, and various theories proposed to explain how life first emerged such as chemical evolution. The theory of evolution by natural selection proposed by Charles Darwin is explained, noting that organisms evolve over time through natural selection acting on genetic variations in populations. Several lines of evidence that support the theory of evolution are outlined, including fossils, embryology, comparative anatomy and morphology, and molecular homology.
The document discusses biotechnology and recombinant DNA technology. It defines biotechnology as using organisms or enzymes from organisms to produce useful products. Recombinant DNA technology involves isolating DNA, fragmenting it with enzymes, inserting fragments into vectors, transforming host cells, and culturing the cells to multiply the DNA. The basic steps are isolating a gene, inserting it into a vector, introducing the vector into a host cell, and using the host to generate multiple copies of the gene.
Ch 13 organism and population || Class 12 ||SAQIB AHMED
Ecology is the study of the relationships between organisms and their environment. The key levels of organization in ecology are organisms, populations, communities, ecosystems, and the biosphere. Populations grow according to exponential or logistic growth models depending on whether resources are unlimited or limited. Species interact through predation, competition, parasitism, commensalism, ammensalism, and mutualism. Abiotic factors like temperature, water, light, and soil influence organisms and drive adaptations.
This document discusses human health and diseases. It defines health and discusses factors that affect health like genetics, lifestyle, and infectious/non-infectious diseases. It then summarizes several common infectious diseases like typhoid, pneumonia, malaria, and their causes, transmission methods, symptoms, and treatment. It also discusses immunity, describing innate and acquired immunity. Innate immunity includes physical and chemical barriers, while acquired immunity involves T cells, B cells, antibodies, and cellular/humoral responses that provide long-term protection against pathogens.
Here is an analysis of variations in a red beetle population across three situations:
Situation 1 (Original population): The population consists of mostly red beetles, with a small percentage of black beetles. The red coloration provides better camouflage in their current environment.
Situation 2 (Environment change): The environment darkens due to increased vegetation/debris. Now black beetles have better camouflage than red beetles. Over time, the percentage of black beetles in the population will increase relative to red beetles, as black beetles survive and reproduce at a higher rate.
Situation 3 (New environment): The environment changes again, this time becoming lighter in color (e.g
This Presentation is especially for the grade 10 as it is informaive and can be used for the CBSE syllabus of india ( of course ). hope this helps you alot and if any problems please let me know from the comments section below.................peace out......... and message me at bavitharavi@hotmail.com. this is also the chpter 9 of the cbse gr 10 science book biology.
The document summarizes R.H. Whittaker's five kingdom classification system from 1969. It describes the key characteristics of each kingdom - Monera, Protista, Fungi, Plantae, and Animalia. Monera contains prokaryotic organisms like bacteria and archaea. Protista contains unicellular eukaryotes. Fungi are heterotrophic organisms that absorb nutrients. Plantae contains photosynthetic eukaryotes. Animalia are multicellular heterotrophs that ingest food. The classification system aimed to group organisms based on cell structure, nutrition, and evolutionary relationships.
This document discusses key characteristics of living organisms and provides examples. It begins by outlining characteristics such as growth, reproduction, metabolism, response to stimuli, homeostasis, and cellular organization. It then discusses several characteristics in more depth, including growth, reproduction, metabolism, cellular organization, and consciousness. The document emphasizes that while these are common traits of living things, no single characteristic can definitively define life. It also covers scientific classification and nomenclature of organisms.
How Do Organisms Reproduce ? - Class 10 CBSE science (BIo)Amit Choube
Organisms reproduce through both asexual and sexual reproduction. Asexual reproduction involves a single parent and no gamete formation, resulting in offspring that are identical clones. Common asexual reproduction methods include binary fission, budding, and spore formation. Sexual reproduction involves two parents and gamete formation with fusion, leading to genetic variation in offspring. In flowering plants, sexual reproduction involves pollination, fertilization within the ovary, and seed formation. In humans, sexual reproduction becomes possible at puberty when secondary sex characteristics develop. The male reproductive system produces sperm in the testes and transfers them via the penis, while the female reproductive system involves eggs released from ovaries and development within the uterus.
Genetics is a branch of biology concerned with the study of genes, genetic variation, and heredity in organisms. Though heredity had been observed for millennia, Gregor Mendel, Moravian scientist and Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring over time. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene.
Trait inheritance and molecular inheritance mechanisms of genes are still primary principles of genetics in the 21st century, but modern genetics has expanded beyond inheritance to studying the function and behavior of genes. Gene structure and function, variation, and distribution are studied within the context of the cell, the organism (e.g. dominance), and within the context of a population. In science and especially in mathematical studies, a variational principle is one that enables a problem to be solved using calculus of variations, which concerns finding functions that optimize the values of quantities that depend on those functions.
This document discusses sexual reproduction in flowering plants. It describes the structures and processes of microsporogenesis and megasporogenesis, which produce microspores and megaspores through meiosis. The microspores develop into pollen grains, and the megaspore develops into the embryo sac. Fertilization occurs when a pollen tube delivers sperm to the embryo sac, resulting in the fusion of gametes and formation of a zygote. The document contrasts the differences between microsporogenesis and megasporogenesis, and discusses self-incompatibility and techniques like emasculation and bagging used to facilitate controlled pollination.
The document discusses transparent, opaque, and translucent materials. Transparent materials let light pass through completely while maintaining the same color. Opaque materials do not let any light pass through. Translucent materials allow some light and color to pass through but not all of it. Examples of each type of material are provided like glass, styrofoam, and tissue paper.
1. Nucleic acids DNA and RNA act as genetic material in living organisms, with DNA serving as the primary genetic material that is faithfully copied and passed on to offspring.
2. Early experiments established that DNA, not protein, was the genetic material through transformation and infection experiments.
3. DNA was shown to be stable and able to replicate, with base-pairing allowing for the duplication of genetic information. While RNA also replicates, it is less stable than DNA due to its structure.
Ch 15 - Biodiversity and Conservation || Class 12 ||SAQIB AHMED
Biodiversity refers to the variety of plant and animal life on Earth. It includes genetic diversity within species, diversity of species, and diversity of ecosystems. Maintaining biodiversity is important because all species are interconnected and play vital roles in ecosystems. The major threats to biodiversity are habitat loss, overexploitation, invasive species, and coextinctions. At current extinction rates, half of all species may be lost within 100 years, constituting a human-caused sixth mass extinction.
Chapter 6. Molecular basis of inheritance.mohan bio
Nucleic acids like DNA and RNA are the genetic material found in living cells. DNA carries genetic information from one generation to the next and is made up of deoxyribose, phosphate groups, and nitrogenous bases. DNA replication is semi-conservative and produces two identical DNA molecules, each with one old and one new strand. Transcription produces mRNA from a DNA template, and translation reads mRNA to produce proteins according to the central dogma of biology.
Evolution is the process of change over generations in the inherited characteristics of biological populations. There are several key points in the origin and evolution of life on Earth according to the document:
1) The universe is approximately 13.8 billion years old. The Earth formed 4.5 billion years ago from gases and dust particles in the solar system.
2) Early theories for the origin of life included special creation by God, panspermia (life originating from space), and spontaneous generation from non-living matter. However, the accepted theory today is chemical evolution - that first life arose gradually from organic molecules on the early Earth.
3) Evidence from fossils, embryology, comparative anatomy and molecular studies supports the theory
This document discusses different levels of ecological organization and biotic and abiotic factors that influence organisms and populations. It covers key topics like:
1. The six levels of ecological organization from organisms to biomes.
2. Major abiotic factors like temperature, water, light, and soil that influence organisms and biotic factors like predators and parasites.
3. How organisms respond and adapt to environmental conditions through processes like thermoregulation, migration, suspension, and adaptation.
4. Attributes of populations like birth rate, death rate, population growth models, and types of population interactions like predation, competition, and parasitism.
Principles of Inheritance, Class 12 CBSEblessiemary
This document provides information about principles of inheritance and variation in genetics. It discusses key topics including:
- Genetics deals with inheritance and variation from parents to offspring. Variation results in offspring differing from parents.
- Gregor Mendel conducted experiments with pea plants in the 1800s and established the principles of heredity, including dominance, segregation, independent assortment. He demonstrated genes are passed from parents to offspring in predictable ratios.
- Chromosomal theory of inheritance later explained that genes are located on chromosomes and segregate during gamete formation according to Mendel's laws. The work of Morgan, Sutton, and Boveri supported this theory through experimentation.
Chapter 16.environmental issues by mohanbiomohan bio
The document discusses various types of pollution including air, water, soil, and radiation pollution. It provides details on the causes and effects of air pollution, describing major air pollutants such as oxides of sulfur and nitrogen. Methods to control air pollution are also outlined, such as electrostatic precipitators and catalytic converters. Water pollution and its effects on biodiversity are then examined, followed by information on other environmental issues like greenhouse effect, global warming, ozone layer depletion, and different forms of waste.
This document discusses biotechnology and recombinant DNA technology. It defines biotechnology as using organisms or enzymes to produce useful products. It explains the principles of genetic engineering and maintaining sterile environments. It also describes the basic tools used in recombinant DNA technology, including restriction endonucleases, cloning vectors, competent host cells. Finally, it outlines the processes involved in recombinant DNA technology such as isolating genetic material, inserting DNA into host cells, and using bioreactors to produce products at large scale.
Biological classification involves the study and organization of organisms into a hierarchy of groups and taxa based on their evolutionary relationships and distinguishing characteristics. The main goals are to identify all organisms and determine their evolutionary history. Carl Linnaeus developed the binomial naming system in the 1700s that is still used today. There are several systems that have been proposed to classify life, with newer systems incorporating molecular evidence to revise the evolutionary relationships between domains, kingdoms, and taxa. Prokaryotes like bacteria and archaea are classified based on characteristics like shape, metabolism, and environment. Eukaryotes like protists, fungi, plants and animals are organized into domains, kingdoms and smaller taxa.
This document provides an overview of the key concepts and theories related to evolutionary biology. It discusses the origin of life on Earth, the early conditions, and various theories proposed to explain how life first emerged such as chemical evolution. The theory of evolution by natural selection proposed by Charles Darwin is explained, noting that organisms evolve over time through natural selection acting on genetic variations in populations. Several lines of evidence that support the theory of evolution are outlined, including fossils, embryology, comparative anatomy and morphology, and molecular homology.
The document discusses biotechnology and recombinant DNA technology. It defines biotechnology as using organisms or enzymes from organisms to produce useful products. Recombinant DNA technology involves isolating DNA, fragmenting it with enzymes, inserting fragments into vectors, transforming host cells, and culturing the cells to multiply the DNA. The basic steps are isolating a gene, inserting it into a vector, introducing the vector into a host cell, and using the host to generate multiple copies of the gene.
Ch 13 organism and population || Class 12 ||SAQIB AHMED
Ecology is the study of the relationships between organisms and their environment. The key levels of organization in ecology are organisms, populations, communities, ecosystems, and the biosphere. Populations grow according to exponential or logistic growth models depending on whether resources are unlimited or limited. Species interact through predation, competition, parasitism, commensalism, ammensalism, and mutualism. Abiotic factors like temperature, water, light, and soil influence organisms and drive adaptations.
This document discusses human health and diseases. It defines health and discusses factors that affect health like genetics, lifestyle, and infectious/non-infectious diseases. It then summarizes several common infectious diseases like typhoid, pneumonia, malaria, and their causes, transmission methods, symptoms, and treatment. It also discusses immunity, describing innate and acquired immunity. Innate immunity includes physical and chemical barriers, while acquired immunity involves T cells, B cells, antibodies, and cellular/humoral responses that provide long-term protection against pathogens.
Here is an analysis of variations in a red beetle population across three situations:
Situation 1 (Original population): The population consists of mostly red beetles, with a small percentage of black beetles. The red coloration provides better camouflage in their current environment.
Situation 2 (Environment change): The environment darkens due to increased vegetation/debris. Now black beetles have better camouflage than red beetles. Over time, the percentage of black beetles in the population will increase relative to red beetles, as black beetles survive and reproduce at a higher rate.
Situation 3 (New environment): The environment changes again, this time becoming lighter in color (e.g
This Presentation is especially for the grade 10 as it is informaive and can be used for the CBSE syllabus of india ( of course ). hope this helps you alot and if any problems please let me know from the comments section below.................peace out......... and message me at bavitharavi@hotmail.com. this is also the chpter 9 of the cbse gr 10 science book biology.
The document summarizes R.H. Whittaker's five kingdom classification system from 1969. It describes the key characteristics of each kingdom - Monera, Protista, Fungi, Plantae, and Animalia. Monera contains prokaryotic organisms like bacteria and archaea. Protista contains unicellular eukaryotes. Fungi are heterotrophic organisms that absorb nutrients. Plantae contains photosynthetic eukaryotes. Animalia are multicellular heterotrophs that ingest food. The classification system aimed to group organisms based on cell structure, nutrition, and evolutionary relationships.
This document discusses key characteristics of living organisms and provides examples. It begins by outlining characteristics such as growth, reproduction, metabolism, response to stimuli, homeostasis, and cellular organization. It then discusses several characteristics in more depth, including growth, reproduction, metabolism, cellular organization, and consciousness. The document emphasizes that while these are common traits of living things, no single characteristic can definitively define life. It also covers scientific classification and nomenclature of organisms.
How Do Organisms Reproduce ? - Class 10 CBSE science (BIo)Amit Choube
Organisms reproduce through both asexual and sexual reproduction. Asexual reproduction involves a single parent and no gamete formation, resulting in offspring that are identical clones. Common asexual reproduction methods include binary fission, budding, and spore formation. Sexual reproduction involves two parents and gamete formation with fusion, leading to genetic variation in offspring. In flowering plants, sexual reproduction involves pollination, fertilization within the ovary, and seed formation. In humans, sexual reproduction becomes possible at puberty when secondary sex characteristics develop. The male reproductive system produces sperm in the testes and transfers them via the penis, while the female reproductive system involves eggs released from ovaries and development within the uterus.
Genetics is a branch of biology concerned with the study of genes, genetic variation, and heredity in organisms. Though heredity had been observed for millennia, Gregor Mendel, Moravian scientist and Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring over time. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene.
Trait inheritance and molecular inheritance mechanisms of genes are still primary principles of genetics in the 21st century, but modern genetics has expanded beyond inheritance to studying the function and behavior of genes. Gene structure and function, variation, and distribution are studied within the context of the cell, the organism (e.g. dominance), and within the context of a population. In science and especially in mathematical studies, a variational principle is one that enables a problem to be solved using calculus of variations, which concerns finding functions that optimize the values of quantities that depend on those functions.
This document discusses sexual reproduction in flowering plants. It describes the structures and processes of microsporogenesis and megasporogenesis, which produce microspores and megaspores through meiosis. The microspores develop into pollen grains, and the megaspore develops into the embryo sac. Fertilization occurs when a pollen tube delivers sperm to the embryo sac, resulting in the fusion of gametes and formation of a zygote. The document contrasts the differences between microsporogenesis and megasporogenesis, and discusses self-incompatibility and techniques like emasculation and bagging used to facilitate controlled pollination.
The document discusses transparent, opaque, and translucent materials. Transparent materials let light pass through completely while maintaining the same color. Opaque materials do not let any light pass through. Translucent materials allow some light and color to pass through but not all of it. Examples of each type of material are provided like glass, styrofoam, and tissue paper.
The document summarizes human reproduction. It describes that human reproduction involves sexual reproduction through the formation and fusion of male and female gametes in the testes and ovaries. It then provides details on the male reproductive system including the testes, accessory ducts, glands, and external genitalia. Spermatogenesis and sperm structure are explained. The female reproductive system including ovaries, oviducts, uterus, cervix, vagina and external genitalia are outlined. The menstrual cycle and mammary glands are also summarized.
Reproductive health involves physical, emotional, and social well-being related to reproduction. Early marriage and lack of knowledge about reproductive health lead to high maternal and infant mortality rates in India. Strategies to improve reproductive health include awareness programs about family planning, fertility regulation, personal hygiene, and sexually transmitted diseases. Population explosion results from declining death rates and lack of reproductive health knowledge. Birth control methods aim to prevent conception through natural family planning methods, barriers, intrauterine devices, oral contraceptives, injections, and surgical sterilization.
1. Reproduction is essential for the continuity of life as it allows organisms to produce offspring. There are two main types of reproduction - asexual reproduction which involves a single parent and sexual reproduction which involves two parents of opposite sex.
2. Asexual reproduction methods include binary fission, budding, and vegetative reproduction through structures like stolons, rhizomes, tubers etc. Sexual reproduction involves the formation of haploid gametes which fuse during fertilization to form a diploid zygote.
3. In plants, sexual reproduction occurs through flowers which contain male stamens and female pistils. Fertilization results in the formation of seeds and fruits. In animals, fertil
Strategies for enhancement in food production2014 by mohanbiomohan bio
This document discusses various strategies for enhancing food production, including animal husbandry, dairy farm management, apiculture, poultry farming, animal breeding techniques, fisheries, and plant breeding. It describes practices like selecting high-yield breeds, maintaining animal health and hygiene, controlling breeding through techniques like artificial insemination, and developing disease-resistant crop varieties through methods such as cross-breeding, mutation breeding, and tissue culture. The document also discusses initiatives like the Green Revolution and Blue Revolution that have aimed to increase global food supply through agricultural advances.
The document discusses three categories of objects - transparent, translucent, and opaque - and asks why certain properties are important for each. Transparent objects allow clear visibility, translucent objects only partially block light, and opaque objects do not allow any light through. Students are asked to sort objects into these categories and create a poster showing their findings.
Chapter 12. biotechnology and its application2014 by mohanbiomohan bio
The document discusses several applications of biotechnology including:
1. Production of human insulin using recombinant DNA technology and other therapeutic products through genetic engineering.
2. Use of microbes and genetic engineering to produce antibiotics, degrade waste, and extract minerals.
3. Genetic engineering of plants through tissue culture and transgenic techniques to develop pest-resistant, drought-tolerant, and nutrient-enhanced crops.
4. Genetic engineering of animals through transgenic techniques for increased milk and meat production.
This document provides information on human health and diseases. It defines health and discusses factors that affect health such as genetics, lifestyle, infections. It classifies diseases as infectious and non-infectious. Common infectious diseases in humans like typhoid, pneumonia, common cold, malaria and their causes, transmission and symptoms are described. The life cycle of the malaria parasite is explained in detail. Other infectious diseases like amoebiasis, ascariasis, filariasis, and ringworm are also outlined. The document then covers immunity, including innate and acquired immunity. It describes the roles of phagocytes, natural killer cells, interferons and inflammatory response in innate immunity. The roles of T lymphocytes and B lymphocytes in acquired immunity
Microbes are microscopic organisms that can only be seen with a microscope. They are found everywhere and play important roles in food production, industrial processes, and environmental management. Many microbes are useful as they help in processes like fermentation of foods and production of antibiotics, enzymes, organic acids, and other bioactive molecules. Microbes are also essential in waste treatment by breaking down organic matter in sewage, and in soil enrichment by fixing nitrogen and making phosphorus available to plants.
The document discusses materials and their properties. It defines materials as physical substances used to make things and lists some main categories as metals, plastics, ceramics, glass and fibers. Everything around us is made of one or more materials. It then discusses properties that describe materials like hard, flexible, strong, etc. and provides examples of properties that could be used to describe common objects like pencils, windows, paper and forks. The document also categorizes materials into groups like metals which are good conductors of heat and electricity and are often shiny, strong and sometimes magnetic.
Light travels in straight lines and can be reflected or refracted. There are three types of materials: transparent, translucent, and opaque. Shadows are formed when an object blocks light. The length and shape of a shadow depends on the position of the light source and object. An experiment was conducted to determine which material - transparent plastic, tissue paper, or black paper - makes the darkest shadow. Black paper produced the darkest shadow because it is opaque and does not let any light pass through.
here you can get a common knowledge about forests and wildlife about its depletion consequences and conservation a basic knowledge about India's wildlife and government programmes
India has a vast array of biological diversity, estimated at 1.6 million species, and is one of the richest countries in terms of species. However, many species are now endangered or vulnerable due to habitat loss from factors like agriculture, development projects, mining, overexploitation, and pollution. While conservation efforts include protected areas like national parks and wildlife sanctuaries, as well as laws banning hunting of protected species, continued conservation action is needed to protect India's biodiversity.
This document discusses India's forest and wildlife resources. It covers the importance of conserving forests and wildlife due to their interdependency in maintaining ecology. Some key points made include: forests act as watersheds and help control climate; wildlife help balance ecosystems. India has rich biodiversity but also high rates of deforestation and species endangerment. Conservation measures discussed include wildlife acts, national parks, project tiger, and community involvement through joint forest management and sacred groves.
India has significant biodiversity with over 50,000 plant varieties, 1,000 mango varieties, and 500 pepper varieties domestically cultivated. Biodiversity refers to the variety of living organisms and includes genetic, species, and ecosystem diversity. India contains several biodiversity hotspots like the Western Ghats and parts of the Himalayas. Threats to Indian biodiversity include habitat destruction, pollution, climate change, and overexploitation. Conservation efforts include protected areas like national parks and wildlife sanctuaries as well as ex situ methods such as botanical gardens, zoos, and gene banks. India has significant biodiversity at risk due to threats, so conservation is important.
This document provides an overview of biodiversity and its conservation in India. It begins by defining biodiversity and describing the different types, including genetic, species, and ecosystem diversity. It then discusses the value of biodiversity in terms of direct consumptive, productive, and indirect social, ethical, and aesthetic values. The document notes that India ranks high in biodiversity as the 10th most plant diverse country and is home to many endemic species. It identifies the Western Ghats and Eastern Himalayas as biodiversity hotspots under threat from habitat loss and wildlife conflicts. The document concludes by explaining the strategies for biodiversity conservation, including both in-situ and ex-situ conservation methods.
Deforestation has led to many negative consequences like increased temperatures and pollution. It disturbs the balance of nature and can decrease rainfall and soil fertility over time. Reforestation efforts are needed to replant trees and restore forests that have been cut down. Government agencies establish protected areas like wildlife sanctuaries, national parks, and biosphere reserves to conserve forests and wildlife.
This document summarizes forest and wildlife biology in India. It discusses that India has high biological diversity, but 10% of flora and 20% of mammals are threatened. Species are classified as normal, endangered, vulnerable, rare, endemic, or extinct. The Wildlife Protection Act of 1972 established national parks and sanctuaries to protect habitats. However, over-exploitation, fires, hunting, habitat destruction, pollution, and poaching have led to a decline in biodiversity. Forests are categorized as reserved, protected, or unclassed based on conservation importance.
Biodiversity conservation is important as the Earth is home to millions of plant and animal species. Biodiversity can be conserved through both in-situ and ex-situ methods. In-situ conservation involves protecting habitats and ecosystems within protected areas like national parks, sanctuaries, biosphere reserves, and sacred forests. Ex-situ conservation involves protecting species outside their natural habitats in facilities like seed banks, gene banks, tissue culture banks, zoos, and botanical gardens. With increasing threats from habitat loss, poaching, and human-wildlife conflict, both in-situ and ex-situ conservation efforts are needed to prevent the extinction of endangered species and maintain Earth's biodiversity.
Biodiversity classification, Biological Hotspots,
Importance of Biodiversity,
Threats to Biodiversity,
Endangered & Endemic species of India,
Conservation of Biodiversity.
Forest and Wildlife Resources Class - 10thNehaRohtagi1
India has a great diversity of forest and wildlife resources which are classified and protected in various ways. Species are categorized as normal, endangered, vulnerable, rare, endemic, or extinct depending on their population levels and risk of depletion. Various factors like hunting, deforestation, and urbanization threaten species. Conservation methods aim to protect habitats and species through laws, reserves, and community involvement in projects like Project Tiger to safeguard India's biological heritage.
This document discusses biodiversity, including its levels, values, hotspots, threats, and methods of conservation. It defines biodiversity as the variety of living organisms on Earth, including different ecosystems. Biodiversity exists at genetic, species, and ecosystem levels and provides values such as food, medicine, fuel and social/cultural importance. Two biodiversity hotspots in India are described that contain many endemic species but are highly threatened. The main threats to biodiversity are habitat loss and degradation, poaching, and human-wildlife conflicts. Conservation methods include in-situ conservation of species within protected natural areas, and ex-situ conservation in zoos, botanical gardens, and gene banks.
This document discusses the importance of conserving wildlife and biodiversity in India. It notes that Jawaharlal Nehru recognized animals and plants make life colorful. It then discusses threats to biodiversity from human activities like deforestation. It defines biodiversity and lists examples of normal, endangered, vulnerable, rare, endemic and extinct species in India. It also discusses Project Tiger which aims to ensure viable tiger populations and preserve biologically important areas. Finally, it provides examples of protected areas in India and their rich biodiversity.
Hey friends,
This is from the chapter "Wildlife and resources". This chapter is from the geograpghy text book of CBSE. This is From the 10th standard syllabus.
Thank you.
This document discusses biodiversity, including its definition, levels, hotspots, and importance. It also covers threats to biodiversity like habitat loss and methods of conservation, both in-situ (within natural habitats like protected areas) and ex-situ (outside habitats, including seed banks, zoos, and botanical gardens). India is highlighted as one of the most biodiverse countries with two biodiversity hotspots, the Western Ghats and Eastern Himalayas, that face serious threats and support many unique and endangered species.
This document discusses biodiversity, its levels and importance. It defines biodiversity as the variety of life on Earth, including genetic, species and ecosystem diversity. Some key threats to biodiversity are habitat loss, poaching, invasive species and climate change. The document also discusses biodiversity hotspots and India's biodiversity, noting areas like the Eastern Himalayas and Western Ghats as global hotspots. Methods of biodiversity conservation discussed include protected areas like national parks as well as ex-situ conservation methods.
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Biodiversity refers to the variety of living organisms from all sources. It exists at genetic, species, and ecosystem levels. Key threats include habitat loss, pollution, and overexploitation. Conservation strategies include protected areas like national parks, sanctuaries, and biosphere reserves which practice in-situ conservation. Ex-situ methods involve conservation outside natural habitats, like zoos. India has high biodiversity as a megadiverse country and is home to two biodiversity hotspots, the Western Ghats and Eastern Himalayas, which face serious threats.
Similar to chapter 15 Biodiversity by mohanbio (20)
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(𝐓𝐋𝐄 𝟏𝟎𝟎) (𝐋𝐞𝐬𝐬𝐨𝐧 𝟏)-𝐏𝐫𝐞𝐥𝐢𝐦𝐬
𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
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𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
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Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) Curriculum
chapter 15 Biodiversity by mohanbio
1.
2.
3. Biodiversity
• The sum total of genes, species and ecosystems of a
given region is called biodiversity.
• The term biodiversity was coined by Edward wilson.
• Levels of biodiversity: The biodiversity is studied in
three levels.
1. Genetic biodiversity.
2. Species biodiversity.
3. Ecological biodiversity.
4. • Genetic biodiversity: Variation of genes found
with in a species is called gene diversity.
• Ex: There are more than 50,000 genetically
different strains of rice and 1000 varieties of
mango are in India.
• Species biodiversity: The variety of species found
in a habitate is called species biodiversity.
• Ex: The Western Ghat has greater diversity of
amphibian species than Eastern Ghat.
• Ecological biodiversity: The variety of different
habitate found in the particular area is called
ecosystem biodiversity.
5. • Global Biodiversity: According to IUCN (2004) the
total number of plant and animal species described
is about 1.5 million.
• It is estimated that global biodiversity has 7 million
species.
• More that 70% of all species recorded are animals.
Plants account for about 22% of the total.
• Insects are more species rich group. 70% of the
animal are insects.
6. Measurement of biodiversity.
• Biodiversity is measured in three ways,
1. α-Biodiversity: It refers to number of species
found in the particular area.
2. β- Biodiversity: It is the comparison of
biodiversity between two habitats.
3. γ- Biodiversity: It is the measure of overall
biodiversity in large land scale.
7. • Importance of Species Diversity to Ecosystem:
• Communities with more species tend to be more
stable than those with less species.
• A stable community has following characters,
• Productivity should not vary too much from year to
year.
• It should not show too much variation
• It has resistance to seasonal disturbances and to
invasion by alien species.
8. • Losses of biodiversity:
• The four major causes of biodiversity loss are,
1. Habitat loss :– Habitat loss is the destruction of ecosystem
by unwanted human activities such as urbanization,
intensive farming, deforestation, mining activities and so on.
• When the vegetation is cleared for human activities the
continuous habitats become fragmented. This is called
habitat fragmentation.
Degradation of natural habitats are threatening the species.
2. Over-exploitation :– It is the harvesting of renewable
resources to the extent.
3. Alien species :– Invasion of alien species in the natural
habitats cause decline in the native species.
4. Co-extinction :– when one organism becomes extinct , the
other associated obligatory species also tend to extinct.
9. Endemic species:
• The species that confined to particular area is
called endemic species.
– Important endemic species of India are,
–
10.
11. It is reported from Western Ghats of Tamil Nadu, Kerala and
Tamil Nadu.
It was originally misidentified as a short-nosed fruit bat but
later identified by Kitti Thonglongya Bangkok as a new species
and was named after Indian ornithologist Salim Ali in 1972.
12.
13. • The Nilgiri Langur
found in the Nilgiri Hills
of the Western Ghats
in South India.
• Its range is Kodagu in
Karnataka, Kodayar
Hills in Tamil Nadu and
many other hilly areas
in Kerala.
14. The species is reported from
the Nilgiris, parts of southern
Kodagu and northern Kerala,
up to the Charmadi ghats.
15. The brown palm
civet's distribution
extends from the
southern tip of
Western Ghats in
Kalakkad Tiger
Reserve ( Tamilnadu -
kanyakumari ) to
Castle Rock in Goa .
They are nocturnal
carnivore.
17. • Biological hotspots: Biological hotspots are
natural environment with high biodiversity
and endemic species.
• Among 34 hotspots of world, the two
biodiversity hotspots of India are western
Ghats and Eastern Himalayas.
18. Threatened species: The species whose population
number is decreasing and likely to decrease more in
future is called threatened species.
• IUCN: International union for conservation of
nature and natural resource.
• Red Data Book: The book maintained by IUCN in
which threatened species are recorded is called red
data book.
• MAB: Man and Biodiversity Programme
• WWF: The World Wildlife Fund for nature
• IBWL: Indian Board for Wildlife
• IBP: International Biological Programme
• UNDP: United Nation Development Programme.
19. • Major categories of threatened species:
• Extinct species: The species that completely
disappeared from earth are called extinct
species.
• Endangered species: The species whose
population is drastically reduced and are in
danger of extinction are called endangered
species. Ex: Asiatic lion, One horned
rhinoceros. Lion tailed macaque. Nilgiri tahr.
20. • Vulnerable species: The species that likely
enters the endangered category are called
vulnerable species.
• Ex: wild goat. Wild yak. Barasinga. Wild
ass, etc.
• Rare species: the species with small
population which are neither endangered nor
vulnerable are called rare species.
21. • Approaches to Biodiversity conservation
• Conservation of biodiversity is done by two
methods:
• In-situ conservation: It is the conservation of
wildlife within their natural habitat.
• Ex: National parks, sanctuaries and biosphere
reserves.
• Ex-situ conservation: It is the conservation of
wildlife outside their natural habitat.
• Ex: Zoo, Botanical garden, Seed bank etc.
22. • Ethical believes play imp role in conservation of
biodiversity.
• Sacred species: The traditionally conserved species
of plant and animals on religious believes are
called sacred species.
• Ex: cow, snake, monkey, elephant, tulasi, neem,
banyan tree, etc.
• Sacred groves: Traditionally conserved patches of
forest that dedicated to local deity are called
sacred groves.
• Ex: Devara kadu. Nagarabana, Boothasthana,
Devabana etc.
23. • Sacred landscape: It is the traditionally
conserved land areas with its natural features.
In these areas human activities and hunting is
banned. It includes forest, grass land, rivers,
ponds etc.
• Ex: kodachdri hills at kollur. Biligiri ranganatha
hills. Etc.
• Biodiversity depletion: The reduction or loss
of plants and animals of biodiversity is called
biodiversity depletion. It causes due to natural
disasters and human activity.
24. • Anthropocentric causes of biodiversity
depletion:
• The cause of biodiversity depletion due to human
activity is called Anthropocentric causes. These
are ,
1. Urbanization.
2. Expansion of agriculture.
3. Deforestation.
4. Pollution.
5. Acidification of soil and water.
6. Soil erosion.
7. Mining activity.
8. Desertification.
25. • Deforestation: The
destruction of forest for
agriculture, industrial or
domestic use is called
Deforestation.
• It leads to loss of habitat,
soil erosion, Desertification,
global worming, and
biodiversity depletion.
26. • Acidification of soil and
water: The decrease in
pH value of soil and
water is called
Acidification of soil and
water.
• It causes due to acid
rain usage of high
chemical fertilizer.
Mining activity,
industrialization, etc.
27. • Most of the soil microbes,
insect, plants aquatic
animals are sensitive to
acidic condition. Hence
acidification leads to
biodiversity depletion
28. • Mining activity: It is the
extraction of non
renewable geological
materials from earth. It
results in,
1. Exploitation of non
renewable resource.
2. It brings deforestation.
3. It causes air, water soil and
noise pollution.
4. It causes soil erosion.
5. It result in biodiversity
depletion.
29. • The smoke combines
with fog and forms
smog.
• It destroys the plant
vegetation.
• In human beings
smog causes
respiratory disorders
and asthma.
30. Biosphere reserves:
• The large undisturbed area where the wild life is protected in their
natural habitat is called biosphere reserves.
• The biosphere reservoir is divided into 3 zones:
• 1. Core zone: Inner most area of biosphere reservoir where
human activity is prevented.
• 2. Buffer zone: It is out side the core zone where human activity
is permitted.
– In buffer zone I, publics are not allowed, only research activities
to wild life is allowed.
– In buffer zone II public can enter for the purpose of observing
wild life. The traditional activity like collection of fruit, seeds
honey are allowed.
• 3. Transition zone: Agricultural activities are noticed in this area.
Soil erosion, deforestation and over grazing are common in this
area.
31. National park
• National parks are protected
areas which is strictly
reserved for conservation of
wild life. The human activity,
grazing, cultivation are
strictly banned in this area.
Imp national parks of India.
• Bandipur national park in
Karnataka. Protected
animals are elephants and
tigers.
32. • Kaziranga national park at Assam. Protected
animals are one horned rhinoceros.
33. • Sundarbans national park at West Bengal.
Protected animals are Bengal tigers. Ridley sea
turtle
34. • Kanha national park at madya Pradesh.
Protected animals are Swamp deer.
35. • Gir national park at Gujarat. Protected animals
are Asiatic lion.
36. • Manasa national park at Himalaya foothills.
Protected animals are tigers, rhinoceros,
elephants.
37. • Ranathambore national park at Rajasthan.
Protected animals are tigers, leopards, Wild
Boars.
38. • Dachigam national park at Jammu- Kashmir.
Protected animals are Hangul (Kashmir stag)
39. Sanctuaries :
• These are the smallest area than the national parks.
In this area human activity is allowed to collect fruits,
seeds, honey, animal grazing etc.
• Wildlife sanctuaries of India.
• Ranganthittu bird sanctuary in Karnataka. Assembled
species of birds are protected.
• Badra wildlife sanctuary in Kanata. The protected
animals are Tigers.
• Periyar wildlife sanctuary at Kerala. The protected
animals are elephants.
• Annamalai wildlife sanctuary at Tamil nadu. The
protected animals are Tigers.
40. Zoological garden:
• The zoo are the place where different
endangered animals are protected.
1. Chamarajendra zoological park at Mysore.
2. Bannergatta zoological park at Bangalore.
3. Pilikula zoological park at Mangalore.
4. Lion safari in talaguppa shimoga
• IBWL: Indian board of wild life.
• WWFI: world wild life India.
41. Global issue:
• Biodiversity depletion and ecological
imbalance is discussed in international level is
called global issue concerned to environment.
• The major global issue are
• Global warming.
• Acid rain formation.
• Ozone depletion.
• Nuclear winter.
42. • Global warming: the
progressive increase in temp of
earth due to increase in green
house gases is called global
warming.
• The green house gases like
CO2,oxides of nitrogen, oxides
of sulphur, methane and water
vapors traps the infra red rays
that reflects back. This
increases the atmospheric
temp.
43. The solar spectrum of electromagnetic waves include
energy packed heat generating waves called radiation
waves. As they lie beyond red color waves of visible
spectrum, they are also called 'infra-red rays'. These
infrared rays lie in the wave length range of 700-900 mm.
44.
45. Effect of global warming.
• The sea level rises due to
melting of ice caps at polar
region.
• It reduces agricultural
yields.
• Alters the rainfall patterns
due to variations in the
convectional current,
caused by difference in
heating pattern of earth's
air.
• Change or shifts in seasons
and seasonal characters
through out the globe.
46. • Control measures.
• Adopting afforestation and reforestation
programs.
• Reducing in use of fossil fuel.
• Using renewable energy resource like solar
energy, wind energy, tidal energy etc.
47. Ozone layer depletion.
• Ozone is the alternative form
of oxygen molecule. It is O3.
The ozone layer is present in
the stratosphere is about 25
km above the earth surface.
• It is a protective layer
protects life on earth by
preventing UV rays, alpha,
beta, and gama rays present
in solar rays.
48. • The thickness of the ozone is measured by an
instrument Ozone mapping spectrometer.
• The reduction in thickness of ozone layer leads
to ozone depletion and ozone hole.
• Through these holes harmful radiations
reaches the earth. It destroys the life and
biodiversity.
• 16th sep is celebrated as world ozone day to
create awareness about ozone layer depletion
49. • The ozone layer is depleting due to chloro fluro
carbon. Halogenated hydrocarbons, carbon
tetra chloride etc.
Effect of ozone layer depletion.
• It increases the influx of UV radiation to earth
surface.
• The UV rays are harmful to plants and animals.
• The harmful rays causes skin cancer, skin burn
etc.
• These rays causes mutation by damaging DNA.
• It effects crop yield.
• It destroys the ovum and larva of amphibians
50. Nuclear winter.
• It is the hypothetical climatic condition of earth that could
be outcome of nuclear war.
• The nuclear war if occurs in future causes nuclear winter.
The effects of nuclear winter are,
• The nuclear explosion set fire storms over cities and
forests.
• It generates enormous smoke and dust in atmosphere.
• It develops black clouds and prevents the sunlight to reach
earth surface.
• This results in fall of surface temp to freezing point.
• The semidarkness and freezing temp effects
photosynthesis and destroys vegetation.
• The radioactive pollutants causes mutations and cancers in
human beings and other animals.