SlideShare a Scribd company logo
1 of 23
SCIENCE PPT
Name-Samba Ghosh
Class -08
Roll No. – 31
Topic – Reproduction in
Animal
Subject - Science
WHAT IS REPRODUCTION?
THE PRODUCTION OF NEW ORGANISM FROM THE EXISTING
ORGANISM OF THE SAME SPECIES IS KNOWN AS REPRODUCTION.
REPRODUCTION IS ESSSNTIAL FOR THE SURVIVAL OF A SPECIES
ON THIS EARTH.
REPRODUCTION BY HUMANBEINGS ENSURES THAT THE HUMAN
SPECIES WILL CONTINUE TO EXIST ON THIS EARTH FPR ALL THE
TIME TO COME.
REPRODUCTION GIVE RISE TO MORE ORGANISM WITH THE SAME
BASIC CHARACTERISTICS AS THEIR PARENTS .
THE NEWLY BORN ANIMAL ( OR NEWLY HATCHED ANIMALS )IS
CALLED YOUNG ONES .
TOPIC :- REPRODUCTION IN ANIMALS
• TOPIC :- REPRODUCTION IN ANIMALS
• WHAY IS REPRODUCTION?
• THE PRODUCTION OF NEW ORGANISM FROM THE EXISTING
ORGANISM OF THE SAME SPECIES IS KNOWN AS REPRODUCTION
• REPRODUCTION IS ESSSNTIAL FOR THE SURVIVAL OF A SPECIES ON
THIS EARTH.
• REPRODUCTION BY HUMANBEINGS ENSURES THAT THE HUMAN
SPECIES WILL CONTINUE TO EXIST ON THIS EARTH FPR ALL THE
TIME TO COME.
• REPRODUCTION GIVE RISE TO MORE ORGANISM WITH THE SAME
BASIC CHARACTERISTICS AS THEIR PARENTS .
• THE NEWLY BORN ANIMAL ( OR NEWLY HATCHED ANIMALS )IS
CALLED YOUNGONES .
METHODS OF REPRODUCTION
THERE ARE TWO TYPES OF REPRODUCTION:-
1. ASEXUAL ROPRODUCTION
2. SEXUAL REPRODUCTION
1. ASEXUAL REPRODUCTION:- THE
PRODUCTION OF A NEW ORGANISM
FROM A SINGLE PARENTS WITHOUT THE
INVOLVEMENT OF SEX CELL( OR GAMETS
) IS CALLED SEXUAL REPRODUCTION .
E.G:-BINARY FISSION IN AMOEBA
2. SEXUAL REPRODUCTION:- THE
PRODUCTION OF A NEW ORGANISM
FROM RWO PARENTS BY MAKING USE
OF THEIR SEX CELL (OR GAMETS)IS
CALLED SEXUAL REPRODUCTION .
E.G:- HUMAN, FISH, FROG.
MALE AND FEMALE
AN ANIMAL HAVING MALE SEX CELL CALLED SPERMS IN ITS
BODY IS CALLED MALE.
AN ANIMAL HAVING FEMALE SEX CELL CALLED EGGS
(OR OVA) IN ITS BODY IS CALLED FEMALE GAMETS.
THE CELL INVOLVE IN SEXUAL REPRRODUCTION IS CALLED GAMETS
1. THE MALE GAMETS IN ANIMALS IS CALLED SPERMS.
2. THE FEMALE GAMETS IN ANIMALS IS CALLED EGG OR OVA.
SPERMS :- THE SPERM IS THE MALE GAMETS. IT IS A SINGLE CELL WITH THE
USUAL CELL COMPONENT LIKE NUCLEUS CELL MEMBRANE IS CALLED SPERM.
EGG (OR OVA) :- THE EGG IS A FEMALE GAMETS . IT IS A SINGLE CELL. THE
HUMAN EGG IS ROUND IN SHAPEAND ABOUT 0.15mm IN DIAMETRE.
ZYGOTE
THE NEW CELL WHICH IS FORMED BY THE FUSION OF A MALE GAMET AND A
FEMALE GAMET IS CALLED ZYGOTE . ZYGOTE IS A AINGLE CELL.
FERTILISATION
THE FUSION OF A MALE GAMETE
WITH A FEMALE GAMETE TO FORM A
ZYGOTTE DURING SEXUAL
REPRODUCTION IS CALLED
FERTILISATION. ZYGOTE IS
ACTUALLY A FERTILISED EGG. IT IS
OF TWO TYPES.THESE ARE AS
FOLLOWS:
1. ITERNAL FERTILISATION
2. EXTERNAL FERTILISATION
SEXUAL REPRODUCTION IN ANIMAL
THE WHOLE PROCESS OF SEXUAL REPRODUCTIONIN ANIMALS INVOLVESTHE
FORMATION OF SPERS AND EGGS, JOINING TPGETHER OF SPERMS AND EGG TO FORM
A FERTILISHDE EGG (ZYGOTE) AND GROWTH AND DEVELOPMENT OF TOFORMA BABY
ANIMAL .IT IS THE PROCESS OF SEXUAL REPRODUTION IN ANIMAL.
i. THE MALE PARENTS PRODUCES MALE GAMETS CALLED SPERMS.
ii. THE FEMALE PARENTS PRODUCE FEMALE GAMETS CALLED OVA.
iii. THE SPERMS ENTER INTO THE EGG . THE NECLEUS OF SPERMS FUSESWITH THE
NUCLEUS OF EGG CELL TO FORM A NEW CELL CALLED ZYGOTE.
iv. THE ZYGOTE DIVIDED REPETEDLLY TO FORM A HOLLOW BALLOF HUNDREADES OF
CELLS WHICH IS CALLED EMBRYO.
v. EMBRYO GROWS AND BECOMES A FOETUS .
vi. FOETUS GROWSAND DEVELOPES A NEW BABY ANIMAL.
THE MALE REPRODUCTIVE SYSTEM
THE MALE REPRODUCTIVE ORGANE CONSIST OF THE
FOLLOWING ORGANS
i. TESTES
ii. SCROTAL SACS
iii. EPIDIDYMIS
iv. SPERM DUCT
v. SEMINAL VESICLES
vi. PENIS
 TESTES ARE THE REAL REEPRODUCTIVE ORGANE
IN MALE
 TESTES MAKE MALE GAMETES CALLED SPERMS
 TESTES PASSES THE SPERMS FROM THE MALE
BODY TO THE FEMALE BODYT THAT CAUSES
FUSION.
FEMALE REPRODUCTIVE ORGAN:-
THE FEMALE REPRODUCTIVE SYSTEM CONSIST OF THE FOLLOWING:-
i. OVARIES
ii. OVIDUCTS
iii. UTERUS
iv. VAGINA
OVARIES ARE THE REAL REPRODUCTIVE ORGANES IN THE FEMALE .
 OVARIES MAKE THWE FEMALE GAMETS CALLED EGG (OR OVA).
 IN HUMAN BEINGS ,OBE MATURE EGGIS RELEASED INTO
OVIDUCT EVERY MONTHBY ONE OF THE OVARIES
 THE FERTILISATION OF EGG BY A SPERMTAKES PLACEIN THE
OVIDUCT.
Fertilization:
The first step in the process of reproduction is the fusion of a sperm and an ovum. When
sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of
the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and
the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.
The process of fertilization is the meeting of an egg cell from the mother and a sperm cell from
the father. So, the new individual inherits some characteristics from the mother and some
from the father.
Fertilization which takes place inside the female body is called internal fertilization. Internal
fertilization occurs in many animals including humans, cows, dogs and hens.
In many animals fertilization takes place outside the body of the female. In these animals,
fertilization takes place in water.
During spring or rainy season, frogs and toads move to ponds and slow flowing streams. When
the male and female come together in water, the female lays hundreds of eggs. Unlike hen’s
egg, frog’s egg is not covered by a shell and it is comparatively very delicate. A layer of jelly
holds the eggs together and provides protection to the eggs.
As the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in
water with the help of its long tail. The sperms come in contact with the eggs. This results in
fertilization. This type of fertilization in which the fusion of a male and a female gamete takes
place outside the body of the female is called external fertilization. It is very common in
aquatic animals such as fish, starfish, etc
FERTILIZATION
Development of Embryo
Fertilization results in the formation of zygote which begins to
develop into an embryo. The zygote divides repeatedly to give rise to
a ball of cells. The cells then begin to form groups that develop into
different tissues and organs of the body. This developing structure is
termed an embryo. The embryo gets embedded in the wall of the
uterus for further development.
The embryo continues to develop in the uterus. It gradually develops
the body parts such as hands, legs, head, eyes, ears, etc. The stage of
the embryo in which all the body parts can be identified is called a
foetus. When the development of the foetus is complete, the mother
gives birth to the baby.
In animals which undergo external fertilization, development of the
embryo takes place outside the female body. The embryos continue
to grow within their egg coverings. After the embryos develop, the
eggs hatch.
Viviparous and Oviparous Animals
Some animals give birth to young ones while
some animals lay eggs which later develop into
young ones. The animals which give birth to
young ones are called viviparous animals. Those
animals which lay eggs are called oviparous
animals.
Metamorphosis is a biological process by which an
animal physically develops after birth or hatching,
involving a conspicuous and relatively abrupt
change in the animal's body structure through cell
growth and differentiation.
Asexual Reproduction
This type of reproduction in which only a single parent is involved is called
asexual reproduction.
In each hydra, there may be one or more bulges. These bulges are the
developing new individuals and they are called buds. In hydra too the new
individuals develop as outgrowths from a single parent. Since new individuals
develop from the buds in hydra, this type of asexual reproduction is called
budding.
Another method of asexual reproduction is observed in the microscopic
organism, amoeba. Amoeba is a single-celled organisms. It begins the process
of reproduction by the division of its nucleus into two nuclei. This is followed by
division of its body into two, each part receiving a nucleus. Finally, two
amoebae are produced from one parent amoeba. This type of asexual
reproduction in which an animal reproduces by dividing into two individuals is
called binary fission.
EXAMPLES OF ASEXUAL REPRODUCTION
. What is test-tube baby?
Answer: Oviducts of some women are blocked due to which
these women are not be able to bear babies. In these type of
cases IVF or in vitro fertilization is done in which freshly
released egg and sperms are kept them together for a few
hours.
Zygote is allowed to develop for about a week and then it
placed in the mother’s uterus and the baby is born and this
technique is called as test-tube babies.
Q. What is implantation?
Answer: The close attachment of the embryo with the walls of
uterus is called implantation.
reproduction in animals class 8

More Related Content

What's hot

The Fundamental Unit Of Life Class 9th By ADHWEAT GUPTA
The Fundamental Unit Of Life Class 9th By ADHWEAT GUPTAThe Fundamental Unit Of Life Class 9th By ADHWEAT GUPTA
The Fundamental Unit Of Life Class 9th By ADHWEAT GUPTA
Adhweat Gupta
 
CELL- STRUCTURE AND FUNCTIONS CLASS 8.pptx
CELL- STRUCTURE AND FUNCTIONS  CLASS 8.pptxCELL- STRUCTURE AND FUNCTIONS  CLASS 8.pptx
CELL- STRUCTURE AND FUNCTIONS CLASS 8.pptx
ADITYA ARYA
 

What's hot (20)

The Fundamental Unit Of Life Class 9th By ADHWEAT GUPTA
The Fundamental Unit Of Life Class 9th By ADHWEAT GUPTAThe Fundamental Unit Of Life Class 9th By ADHWEAT GUPTA
The Fundamental Unit Of Life Class 9th By ADHWEAT GUPTA
 
Sound chapter 12 class-8
Sound chapter  12 class-8Sound chapter  12 class-8
Sound chapter 12 class-8
 
Chapter - 7, Conservation of Plants and Animals, Science, Class 8
Chapter - 7, Conservation of Plants and Animals, Science, Class 8Chapter - 7, Conservation of Plants and Animals, Science, Class 8
Chapter - 7, Conservation of Plants and Animals, Science, Class 8
 
tissues
tissuestissues
tissues
 
diversity in living organisms
diversity in living organismsdiversity in living organisms
diversity in living organisms
 
Chemical effects of electric current
Chemical effects of  electric currentChemical effects of  electric current
Chemical effects of electric current
 
Electric Current and its Effects Class 7th ppt
Electric Current and its Effects Class 7th pptElectric Current and its Effects Class 7th ppt
Electric Current and its Effects Class 7th ppt
 
combustion and flame
combustion and flamecombustion and flame
combustion and flame
 
matter in our surroundings
matter in our surroundingsmatter in our surroundings
matter in our surroundings
 
Chapter 01 crop production & management
Chapter 01   crop production  & managementChapter 01   crop production  & management
Chapter 01 crop production & management
 
Nutrition in Animals, Class 7, Science Chapter-2
Nutrition in Animals, Class 7, Science Chapter-2Nutrition in Animals, Class 7, Science Chapter-2
Nutrition in Animals, Class 7, Science Chapter-2
 
Friction CLASS 8 NCERT powerpoint presentation
Friction  CLASS 8 NCERT powerpoint presentation  Friction  CLASS 8 NCERT powerpoint presentation
Friction CLASS 8 NCERT powerpoint presentation
 
class 8, chapter -12 friction
 class 8, chapter -12 friction class 8, chapter -12 friction
class 8, chapter -12 friction
 
Manshi 8th a science reproduction in animals
Manshi 8th a science reproduction in animalsManshi 8th a science reproduction in animals
Manshi 8th a science reproduction in animals
 
CELL- STRUCTURE AND FUNCTIONS CLASS 8.pptx
CELL- STRUCTURE AND FUNCTIONS  CLASS 8.pptxCELL- STRUCTURE AND FUNCTIONS  CLASS 8.pptx
CELL- STRUCTURE AND FUNCTIONS CLASS 8.pptx
 
Getting to know plants
Getting to know plantsGetting to know plants
Getting to know plants
 
18. Wastewater Story by Dilip Kumar Chandra
18. Wastewater Story by Dilip Kumar Chandra18. Wastewater Story by Dilip Kumar Chandra
18. Wastewater Story by Dilip Kumar Chandra
 
improvement in food resources
 improvement in food resources improvement in food resources
improvement in food resources
 
Chapter - 13, Sound, Science, Class 8
Chapter - 13, Sound, Science, Class 8Chapter - 13, Sound, Science, Class 8
Chapter - 13, Sound, Science, Class 8
 
Chapter - 10, Respiration in Organisms, Science, Class 7
Chapter - 10, Respiration in Organisms, Science, Class 7Chapter - 10, Respiration in Organisms, Science, Class 7
Chapter - 10, Respiration in Organisms, Science, Class 7
 

Similar to reproduction in animals class 8

Reproduction in Animals Class 8 basic concepts
Reproduction in Animals Class 8 basic conceptsReproduction in Animals Class 8 basic concepts
Reproduction in Animals Class 8 basic concepts
satyajeetparida3
 
Reproduction in animals
Reproduction in animalsReproduction in animals
Reproduction in animals
skbodh
 

Similar to reproduction in animals class 8 (20)

Preseantation on reproduction in animals
Preseantation on reproduction in animalsPreseantation on reproduction in animals
Preseantation on reproduction in animals
 
PPT REPRODUCTION.pptx
PPT REPRODUCTION.pptxPPT REPRODUCTION.pptx
PPT REPRODUCTION.pptx
 
SH02EB~1.PPT powerpoint in Earth and LIfe science
SH02EB~1.PPT powerpoint in Earth and LIfe scienceSH02EB~1.PPT powerpoint in Earth and LIfe science
SH02EB~1.PPT powerpoint in Earth and LIfe science
 
Manshi 8th a science reproduction in animals
Manshi 8th a science reproduction in animalsManshi 8th a science reproduction in animals
Manshi 8th a science reproduction in animals
 
Reproduction in animals
 Reproduction in animals Reproduction in animals
Reproduction in animals
 
Reproduction in animals
Reproduction in animalsReproduction in animals
Reproduction in animals
 
Science
ScienceScience
Science
 
reproduction in animals
reproduction in animalsreproduction in animals
reproduction in animals
 
ICA_9B Reproduction_In_Animals.pptx
ICA_9B Reproduction_In_Animals.pptxICA_9B Reproduction_In_Animals.pptx
ICA_9B Reproduction_In_Animals.pptx
 
Reproduction in Animals Class 8 basic concepts
Reproduction in Animals Class 8 basic conceptsReproduction in Animals Class 8 basic concepts
Reproduction in Animals Class 8 basic concepts
 
Reproduction in animals
Reproduction in animalsReproduction in animals
Reproduction in animals
 
Animals
AnimalsAnimals
Animals
 
Reproduction in animals
Reproduction in animalsReproduction in animals
Reproduction in animals
 
Class 8 reproduction in animals Study material pdf
Class 8 reproduction in animals Study material pdfClass 8 reproduction in animals Study material pdf
Class 8 reproduction in animals Study material pdf
 
REPRODUCTION IN ANIMALS.pptx
REPRODUCTION IN ANIMALS.pptxREPRODUCTION IN ANIMALS.pptx
REPRODUCTION IN ANIMALS.pptx
 
Animal Reproduction
Animal ReproductionAnimal Reproduction
Animal Reproduction
 
Earth and Life Science-Q2-WK3-ANIMAL-REPRODUCTION.pptx
Earth and Life Science-Q2-WK3-ANIMAL-REPRODUCTION.pptxEarth and Life Science-Q2-WK3-ANIMAL-REPRODUCTION.pptx
Earth and Life Science-Q2-WK3-ANIMAL-REPRODUCTION.pptx
 
Class 8 - Chapter 12 Reproduction in Animals.pptx
Class 8 - Chapter 12 Reproduction in Animals.pptxClass 8 - Chapter 12 Reproduction in Animals.pptx
Class 8 - Chapter 12 Reproduction in Animals.pptx
 
asexual ans sexual reproduction.pptx
asexual ans sexual reproduction.pptxasexual ans sexual reproduction.pptx
asexual ans sexual reproduction.pptx
 
Chapter 4 Reproduction
Chapter 4 ReproductionChapter 4 Reproduction
Chapter 4 Reproduction
 

Recently uploaded

Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...
Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...
Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...
US Environmental Protection Agency (EPA), Center for Computational Toxicology and Exposure
 
Isolation of AMF by wet sieving and decantation method pptx
Isolation of AMF by wet sieving and decantation method pptxIsolation of AMF by wet sieving and decantation method pptx
Isolation of AMF by wet sieving and decantation method pptx
GOWTHAMIM22
 
HIV AND INFULENZA VIRUS PPT HIV PPT INFULENZA VIRUS PPT
HIV AND INFULENZA VIRUS PPT HIV PPT  INFULENZA VIRUS PPTHIV AND INFULENZA VIRUS PPT HIV PPT  INFULENZA VIRUS PPT

Recently uploaded (20)

RACEMIzATION AND ISOMERISATION completed.pptx
RACEMIzATION AND ISOMERISATION completed.pptxRACEMIzATION AND ISOMERISATION completed.pptx
RACEMIzATION AND ISOMERISATION completed.pptx
 
Costs to heap leach gold ore tailings in Karamoja region of Uganda
Costs to heap leach gold ore tailings in Karamoja region of UgandaCosts to heap leach gold ore tailings in Karamoja region of Uganda
Costs to heap leach gold ore tailings in Karamoja region of Uganda
 
GBSN - Microbiology (Unit 6) Human and Microbial interaction
GBSN - Microbiology (Unit 6) Human and Microbial interactionGBSN - Microbiology (Unit 6) Human and Microbial interaction
GBSN - Microbiology (Unit 6) Human and Microbial interaction
 
Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...
Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...
Chemistry Data Delivery from the US-EPA Center for Computational Toxicology a...
 
Molecular and Cellular Mechanism of Action of Hormones such as Growth Hormone...
Molecular and Cellular Mechanism of Action of Hormones such as Growth Hormone...Molecular and Cellular Mechanism of Action of Hormones such as Growth Hormone...
Molecular and Cellular Mechanism of Action of Hormones such as Growth Hormone...
 
GBSN - Microbiology (Unit 5) Concept of isolation
GBSN - Microbiology (Unit 5) Concept of isolationGBSN - Microbiology (Unit 5) Concept of isolation
GBSN - Microbiology (Unit 5) Concept of isolation
 
MSC IV_Forensic medicine - Mechanical injuries.pdf
MSC IV_Forensic medicine - Mechanical injuries.pdfMSC IV_Forensic medicine - Mechanical injuries.pdf
MSC IV_Forensic medicine - Mechanical injuries.pdf
 
ABHISHEK ANTIBIOTICS PPT MICROBIOLOGY // USES OF ANTIOBIOTICS TYPES OF ANTIB...
ABHISHEK ANTIBIOTICS PPT MICROBIOLOGY  // USES OF ANTIOBIOTICS TYPES OF ANTIB...ABHISHEK ANTIBIOTICS PPT MICROBIOLOGY  // USES OF ANTIOBIOTICS TYPES OF ANTIB...
ABHISHEK ANTIBIOTICS PPT MICROBIOLOGY // USES OF ANTIOBIOTICS TYPES OF ANTIB...
 
Isolation of AMF by wet sieving and decantation method pptx
Isolation of AMF by wet sieving and decantation method pptxIsolation of AMF by wet sieving and decantation method pptx
Isolation of AMF by wet sieving and decantation method pptx
 
FORENSIC CHEMISTRY ARSON INVESTIGATION.pdf
FORENSIC CHEMISTRY ARSON INVESTIGATION.pdfFORENSIC CHEMISTRY ARSON INVESTIGATION.pdf
FORENSIC CHEMISTRY ARSON INVESTIGATION.pdf
 
MODERN PHYSICS_REPORTING_QUANTA_.....pdf
MODERN PHYSICS_REPORTING_QUANTA_.....pdfMODERN PHYSICS_REPORTING_QUANTA_.....pdf
MODERN PHYSICS_REPORTING_QUANTA_.....pdf
 
A Scientific PowerPoint on Albert Einstein
A Scientific PowerPoint on Albert EinsteinA Scientific PowerPoint on Albert Einstein
A Scientific PowerPoint on Albert Einstein
 
Manganese‐RichSandstonesasanIndicatorofAncientOxic LakeWaterConditionsinGale...
Manganese‐RichSandstonesasanIndicatorofAncientOxic  LakeWaterConditionsinGale...Manganese‐RichSandstonesasanIndicatorofAncientOxic  LakeWaterConditionsinGale...
Manganese‐RichSandstonesasanIndicatorofAncientOxic LakeWaterConditionsinGale...
 
Alternative method of dissolution in-vitro in-vivo correlation and dissolutio...
Alternative method of dissolution in-vitro in-vivo correlation and dissolutio...Alternative method of dissolution in-vitro in-vivo correlation and dissolutio...
Alternative method of dissolution in-vitro in-vivo correlation and dissolutio...
 
In-pond Race way systems for Aquaculture (IPRS).pptx
In-pond Race way systems for Aquaculture (IPRS).pptxIn-pond Race way systems for Aquaculture (IPRS).pptx
In-pond Race way systems for Aquaculture (IPRS).pptx
 
PHOTOSYNTHETIC BACTERIA (OXYGENIC AND ANOXYGENIC)
PHOTOSYNTHETIC BACTERIA  (OXYGENIC AND ANOXYGENIC)PHOTOSYNTHETIC BACTERIA  (OXYGENIC AND ANOXYGENIC)
PHOTOSYNTHETIC BACTERIA (OXYGENIC AND ANOXYGENIC)
 
Soil and Water Conservation Engineering (SWCE) is a specialized field of stud...
Soil and Water Conservation Engineering (SWCE) is a specialized field of stud...Soil and Water Conservation Engineering (SWCE) is a specialized field of stud...
Soil and Water Conservation Engineering (SWCE) is a specialized field of stud...
 
GBSN - Microbiology (Unit 7) Microbiology in Everyday Life
GBSN - Microbiology (Unit 7) Microbiology in Everyday LifeGBSN - Microbiology (Unit 7) Microbiology in Everyday Life
GBSN - Microbiology (Unit 7) Microbiology in Everyday Life
 
HIV AND INFULENZA VIRUS PPT HIV PPT INFULENZA VIRUS PPT
HIV AND INFULENZA VIRUS PPT HIV PPT  INFULENZA VIRUS PPTHIV AND INFULENZA VIRUS PPT HIV PPT  INFULENZA VIRUS PPT
HIV AND INFULENZA VIRUS PPT HIV PPT INFULENZA VIRUS PPT
 
X-rays from a Central “Exhaust Vent” of the Galactic Center Chimney
X-rays from a Central “Exhaust Vent” of the Galactic Center ChimneyX-rays from a Central “Exhaust Vent” of the Galactic Center Chimney
X-rays from a Central “Exhaust Vent” of the Galactic Center Chimney
 

reproduction in animals class 8

  • 1. SCIENCE PPT Name-Samba Ghosh Class -08 Roll No. – 31 Topic – Reproduction in Animal Subject - Science
  • 2.
  • 3. WHAT IS REPRODUCTION? THE PRODUCTION OF NEW ORGANISM FROM THE EXISTING ORGANISM OF THE SAME SPECIES IS KNOWN AS REPRODUCTION. REPRODUCTION IS ESSSNTIAL FOR THE SURVIVAL OF A SPECIES ON THIS EARTH. REPRODUCTION BY HUMANBEINGS ENSURES THAT THE HUMAN SPECIES WILL CONTINUE TO EXIST ON THIS EARTH FPR ALL THE TIME TO COME. REPRODUCTION GIVE RISE TO MORE ORGANISM WITH THE SAME BASIC CHARACTERISTICS AS THEIR PARENTS . THE NEWLY BORN ANIMAL ( OR NEWLY HATCHED ANIMALS )IS CALLED YOUNG ONES . TOPIC :- REPRODUCTION IN ANIMALS
  • 4. • TOPIC :- REPRODUCTION IN ANIMALS • WHAY IS REPRODUCTION? • THE PRODUCTION OF NEW ORGANISM FROM THE EXISTING ORGANISM OF THE SAME SPECIES IS KNOWN AS REPRODUCTION • REPRODUCTION IS ESSSNTIAL FOR THE SURVIVAL OF A SPECIES ON THIS EARTH. • REPRODUCTION BY HUMANBEINGS ENSURES THAT THE HUMAN SPECIES WILL CONTINUE TO EXIST ON THIS EARTH FPR ALL THE TIME TO COME. • REPRODUCTION GIVE RISE TO MORE ORGANISM WITH THE SAME BASIC CHARACTERISTICS AS THEIR PARENTS . • THE NEWLY BORN ANIMAL ( OR NEWLY HATCHED ANIMALS )IS CALLED YOUNGONES . METHODS OF REPRODUCTION THERE ARE TWO TYPES OF REPRODUCTION:- 1. ASEXUAL ROPRODUCTION 2. SEXUAL REPRODUCTION 1. ASEXUAL REPRODUCTION:- THE PRODUCTION OF A NEW ORGANISM FROM A SINGLE PARENTS WITHOUT THE INVOLVEMENT OF SEX CELL( OR GAMETS ) IS CALLED SEXUAL REPRODUCTION . E.G:-BINARY FISSION IN AMOEBA 2. SEXUAL REPRODUCTION:- THE PRODUCTION OF A NEW ORGANISM FROM RWO PARENTS BY MAKING USE OF THEIR SEX CELL (OR GAMETS)IS CALLED SEXUAL REPRODUCTION . E.G:- HUMAN, FISH, FROG.
  • 5. MALE AND FEMALE AN ANIMAL HAVING MALE SEX CELL CALLED SPERMS IN ITS BODY IS CALLED MALE. AN ANIMAL HAVING FEMALE SEX CELL CALLED EGGS (OR OVA) IN ITS BODY IS CALLED FEMALE GAMETS. THE CELL INVOLVE IN SEXUAL REPRRODUCTION IS CALLED GAMETS 1. THE MALE GAMETS IN ANIMALS IS CALLED SPERMS. 2. THE FEMALE GAMETS IN ANIMALS IS CALLED EGG OR OVA. SPERMS :- THE SPERM IS THE MALE GAMETS. IT IS A SINGLE CELL WITH THE USUAL CELL COMPONENT LIKE NUCLEUS CELL MEMBRANE IS CALLED SPERM. EGG (OR OVA) :- THE EGG IS A FEMALE GAMETS . IT IS A SINGLE CELL. THE HUMAN EGG IS ROUND IN SHAPEAND ABOUT 0.15mm IN DIAMETRE. ZYGOTE THE NEW CELL WHICH IS FORMED BY THE FUSION OF A MALE GAMET AND A FEMALE GAMET IS CALLED ZYGOTE . ZYGOTE IS A AINGLE CELL.
  • 6. FERTILISATION THE FUSION OF A MALE GAMETE WITH A FEMALE GAMETE TO FORM A ZYGOTTE DURING SEXUAL REPRODUCTION IS CALLED FERTILISATION. ZYGOTE IS ACTUALLY A FERTILISED EGG. IT IS OF TWO TYPES.THESE ARE AS FOLLOWS: 1. ITERNAL FERTILISATION 2. EXTERNAL FERTILISATION
  • 7.
  • 8. SEXUAL REPRODUCTION IN ANIMAL THE WHOLE PROCESS OF SEXUAL REPRODUCTIONIN ANIMALS INVOLVESTHE FORMATION OF SPERS AND EGGS, JOINING TPGETHER OF SPERMS AND EGG TO FORM A FERTILISHDE EGG (ZYGOTE) AND GROWTH AND DEVELOPMENT OF TOFORMA BABY ANIMAL .IT IS THE PROCESS OF SEXUAL REPRODUTION IN ANIMAL. i. THE MALE PARENTS PRODUCES MALE GAMETS CALLED SPERMS. ii. THE FEMALE PARENTS PRODUCE FEMALE GAMETS CALLED OVA. iii. THE SPERMS ENTER INTO THE EGG . THE NECLEUS OF SPERMS FUSESWITH THE NUCLEUS OF EGG CELL TO FORM A NEW CELL CALLED ZYGOTE. iv. THE ZYGOTE DIVIDED REPETEDLLY TO FORM A HOLLOW BALLOF HUNDREADES OF CELLS WHICH IS CALLED EMBRYO. v. EMBRYO GROWS AND BECOMES A FOETUS . vi. FOETUS GROWSAND DEVELOPES A NEW BABY ANIMAL.
  • 9. THE MALE REPRODUCTIVE SYSTEM THE MALE REPRODUCTIVE ORGANE CONSIST OF THE FOLLOWING ORGANS i. TESTES ii. SCROTAL SACS iii. EPIDIDYMIS iv. SPERM DUCT v. SEMINAL VESICLES vi. PENIS  TESTES ARE THE REAL REEPRODUCTIVE ORGANE IN MALE  TESTES MAKE MALE GAMETES CALLED SPERMS  TESTES PASSES THE SPERMS FROM THE MALE BODY TO THE FEMALE BODYT THAT CAUSES FUSION.
  • 10. FEMALE REPRODUCTIVE ORGAN:- THE FEMALE REPRODUCTIVE SYSTEM CONSIST OF THE FOLLOWING:- i. OVARIES ii. OVIDUCTS iii. UTERUS iv. VAGINA OVARIES ARE THE REAL REPRODUCTIVE ORGANES IN THE FEMALE .  OVARIES MAKE THWE FEMALE GAMETS CALLED EGG (OR OVA).  IN HUMAN BEINGS ,OBE MATURE EGGIS RELEASED INTO OVIDUCT EVERY MONTHBY ONE OF THE OVARIES  THE FERTILISATION OF EGG BY A SPERMTAKES PLACEIN THE OVIDUCT.
  • 11.
  • 12. Fertilization: The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote. The process of fertilization is the meeting of an egg cell from the mother and a sperm cell from the father. So, the new individual inherits some characteristics from the mother and some from the father. Fertilization which takes place inside the female body is called internal fertilization. Internal fertilization occurs in many animals including humans, cows, dogs and hens. In many animals fertilization takes place outside the body of the female. In these animals, fertilization takes place in water. During spring or rainy season, frogs and toads move to ponds and slow flowing streams. When the male and female come together in water, the female lays hundreds of eggs. Unlike hen’s egg, frog’s egg is not covered by a shell and it is comparatively very delicate. A layer of jelly holds the eggs together and provides protection to the eggs. As the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in water with the help of its long tail. The sperms come in contact with the eggs. This results in fertilization. This type of fertilization in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilization. It is very common in aquatic animals such as fish, starfish, etc
  • 14. Development of Embryo Fertilization results in the formation of zygote which begins to develop into an embryo. The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed an embryo. The embryo gets embedded in the wall of the uterus for further development. The embryo continues to develop in the uterus. It gradually develops the body parts such as hands, legs, head, eyes, ears, etc. The stage of the embryo in which all the body parts can be identified is called a foetus. When the development of the foetus is complete, the mother gives birth to the baby. In animals which undergo external fertilization, development of the embryo takes place outside the female body. The embryos continue to grow within their egg coverings. After the embryos develop, the eggs hatch.
  • 15.
  • 16. Viviparous and Oviparous Animals Some animals give birth to young ones while some animals lay eggs which later develop into young ones. The animals which give birth to young ones are called viviparous animals. Those animals which lay eggs are called oviparous animals.
  • 17.
  • 18. Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation.
  • 19.
  • 20. Asexual Reproduction This type of reproduction in which only a single parent is involved is called asexual reproduction. In each hydra, there may be one or more bulges. These bulges are the developing new individuals and they are called buds. In hydra too the new individuals develop as outgrowths from a single parent. Since new individuals develop from the buds in hydra, this type of asexual reproduction is called budding. Another method of asexual reproduction is observed in the microscopic organism, amoeba. Amoeba is a single-celled organisms. It begins the process of reproduction by the division of its nucleus into two nuclei. This is followed by division of its body into two, each part receiving a nucleus. Finally, two amoebae are produced from one parent amoeba. This type of asexual reproduction in which an animal reproduces by dividing into two individuals is called binary fission.
  • 21. EXAMPLES OF ASEXUAL REPRODUCTION
  • 22. . What is test-tube baby? Answer: Oviducts of some women are blocked due to which these women are not be able to bear babies. In these type of cases IVF or in vitro fertilization is done in which freshly released egg and sperms are kept them together for a few hours. Zygote is allowed to develop for about a week and then it placed in the mother’s uterus and the baby is born and this technique is called as test-tube babies. Q. What is implantation? Answer: The close attachment of the embryo with the walls of uterus is called implantation.