This document provides a summary of a biology project on biological classification by Ayush Gupta, an 11th grade student. It discusses the history of classification from Aristotle to Linnaeus and introduces the five kingdom system of R.H. Whittaker that divides organisms into Monera, Protista, Fungi, Plantae, and Animalia. Key details are provided about each kingdom, including examples of bacteria, protists, fungi, plants, and animals. The document also notes some acellular organisms and lichens that are not classified in the five kingdom system.
Biological Classification, CH-2 of Class-XI.
Dear students
I have prepared the ppt based on NCERT, as per your requirement. Its full of images, examples, activities and also i have attached one worksheet with it. Hope you like it.
Biological Classification, CH-2 of Class-XI.
Dear students
I have prepared the ppt based on NCERT, as per your requirement. Its full of images, examples, activities and also i have attached one worksheet with it. Hope you like it.
Ch 2 biological classification ppt , this ppt includes importance of classification and two kingdom , 3 and 4 kingdom classification along with five and 6 kingdom classification. Classification by R.H. Whittaker is discussed in detail.
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The chordates are named for the notochord: a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and also in the adult stage of some chordate species.
It is located between the digestive tube and the nerve cord, providing skeletal support through the length of the body.
In some chordates, the notochord acts as the primary axial support of the body throughout the animal's lifetime.
Ch 2 biological classification ppt , this ppt includes importance of classification and two kingdom , 3 and 4 kingdom classification along with five and 6 kingdom classification. Classification by R.H. Whittaker is discussed in detail.
human evolution, origin of life, big bang theory, theories on origin of life, evolution of life forms, experimental evidence on theory of chemical evolution, evidences of evolution, homology and analogy, biochemical and biogeographical evidences, adaptive radiation, lamarck's theory of evolution, darwins theory of evolution, mechanism of evolution, hardy weinberg principle, mutations
The chordates are named for the notochord: a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and also in the adult stage of some chordate species.
It is located between the digestive tube and the nerve cord, providing skeletal support through the length of the body.
In some chordates, the notochord acts as the primary axial support of the body throughout the animal's lifetime.
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3. What is Biological
classification ?
The process of grouping together various
organisms according to their similarities,
dissimilarities and phylogenetic descent is known
as biological classification.
4. CLASSIFICATION HISTORY
OF ARISTOTLE
There have been various attempts
to classify organisms. The earliest
was by Aristotle, who classified
plants into herbs shrubs and trees.
He classified animals into two
groups, based on the presence and
absence of red blood.
6. KINGDOM
CLASSIFICATION
R.H. Whittaker proposed the Five Kingdom
system of classification and classified organisms,
based on cellular structure, complexity, mode of
nutrition, phylogenetic relationship and
ecological role performed by them.
Whittaker divided organisms into Monera,
Protista, Fungi, Plantae and Animalia.
10. Click to add text
This group includes all kinds of bacteria, having a prokaryotic cell
The cell does not contain a nucleus
There are different shapes of bacteria present; spherical- cocci, rod-shaped- bacillus, comma- vibrio and
spiral- spirilla
They mainly reproduce by fission, spore formation under unfavourable conditions and also by DNA transfer
from one bacterium cell to another
Mycoplasma lack the cell wall and are the smallest cell to survive without oxygen
Archaebacteria- These bacteria are present in the harshest environmental conditions such as salty, marshy
and in hot springs. They are known as halophiles, methanogens, thermoacidophiles, respectively
Methanogens are present in the gut of ruminants and produce biogas
Eubacteria- These are true bacteria and have a rigid cell wall and motile organisms have flagell
11. Photosynthetic Autotrophs- They include Cyanobacteria (Blue-green
Algae). They have chlorophylls and carotenoids. They are unicellular,
filamentous or colonial and body is covered by a mucilaginous
sheath. Nostoc and Anabaena have heterocysts, where they can fix
atmospheric nitrogen.
Chemosynthetic Autotrophs- They play an important role in recycling the
nutrients. They get the required energy for ATP generation from the
oxidation of various inorganic substances such as ammonia, nitrates and
nitrites.
Heterotrophic- There is a wide variety of heterotrophic bacteria. They act
as a decomposer. They are used for various purposes such as nitrogen-
fixing, curd and antibiotics production. Many bacteria are pathogen
various diseases of plants and animals, e.g. citrus canker, tetanus, typhoid,
cholera.
13. The group includes unicellular
eukaryotes
A photosynthetic protist is a link
between plants and animals
They contain a well-defined nucleus
and other membrane-bound cell
organelles
They include protozoan, slime moulds,
chrysophytes, dinoflagellates and
euglenoids
14. Chrysophytes
• Include diatoms and desmids
(golden algae)
• They are mostly photosynthetic and
have indestructible cell wall due to
the presence of silica
• The cell wall makes two thin
overlapping shells, which fit like a
soapbox on the outer surface
• Diatomaceous earth is the deposit
of the cell wall that gets
accumulated. It is used for filtration
and polishing
15. Dinoflagellates
They are photosynthetic and
marine
They are found in many
colours like yellow, green, red,
blue, brown, according to the
pigment present
Stiff cellulose plates are
present on the cell wall
They multiply rapidly and
cause red tide
Many dinoflagellates emit
blue-green light and are
bioluminescent
16. Euglenoids
They are photosynthetic flagellated
protist
They are a link between plants and
animals. They perform photosynthesis
but lack a cell wall
The characteristic feature is the presence
of pellicle, a protein-rich layer, which
makes their body flexible
In the absence of sunlight, they feed on
small organisms and behave as a
heterotroph
Also read: Euglena Classification
Click to add text
17. Slime moulds
They are saprophytic protists feeding
on organic materials from decaying
twigs and leaves
Aggregation of slime moulds is called
plasmodium, which they form under
favourable conditions
Under unfavourable conditions,
fruiting bodies containing spores
develop at the tip of plasmodium
These spores can survive for very
long under adverse conditions and
have true walls
18. Protozoans
The group contains all the unicellular, eukaryotic, heterotrophs, which are parasites or predators
These are divided into 4 major groups:
1. Amoeboid- They are characterised by the presence of pseudopodia, which are used for
movement and catching of prey, e.g. Amoeba. Marine amoeboids have silica shells. Some of
the amoeboids are parasites, e.g. Entamoeba histolytica causes amoebic dysentery
2. Flagellated- They are characterised by the presence of flagella. Some of them are parasites
causing various diseases, e.g Trypanosoma causes sleeping sickness
3. Ciliated- They have thousands of cilia on their body surface. The coordinated movement of
cilia helps in steering the water having food into the gullet (body cavity, which opens outside
the body surface), e.g. Paramoecium
4. Sporozoans- They are characterised by the formation of spores, which is the infectious stage,
e.g. Plasmodium
20. Fungi are cosmopolitan and found everywhere
They are heterotrophic and get the nutrients by absorption
Their cell wall is made up of chitin or fungal cellulose
Their mode of nutrition is saprophytic, parasitic or symbiotic and the main
food reserve is glycogen
Vegetative reproduction is by fragmentation, budding or fission
Asexual reproduction is by spores formation such as conidia, zoospores,
sporangiospores
Sexual reproduction is by oospore, ascospore or basidiospore formation in
distinct fruiting bodies
In sexual reproduction, plasmogamy (fusion of protoplasm) is followed by
karyogamy (fusion of nuclei)
In basidiomycetes and ascomycetes, plasmogamy is not immediately
followed by karyogamy, resulting in a distinct dikaryon (n+n) cell having 2
nuclei per cell
Fungi are divided into four major classes on the basis of types and mode
of spore formation and the structure of mycelium
21.
22. Some Important Fungi:
Yeast- used in fermentation to
make cheese, bread, beer
Penicillium- antibiotics source Puccinia- causes wheat rust Ustilago- causes smut disease
Symbionts- Lichens (symbiotic
association of fungi with algae),
Mycorrhiza (symbiotic association
of fungi with roots of green
plants)
Rhizopus- the bread mould
Albugo- the parasitic fungi on
mustard
Neurospora- extensively used in
genetic and biochemical work
Truffles and Morels- edible and
are considered a delicacy
Agaricus- edible as well as
poisonous species
24. Mostly autotrophic, chlorophyll-
containing, eukaryotic organisms
Characterised by the presence of rigid
cell wall made up of cellulose
Some plants are partially heterotrophic
such as Insectivorous (Venus flytrap,
Bladderwort) and parasites (Cuscuta)
Kingdom Plantae includes Algae,
Bryophytes, Pteridophytes,
Gymnosperms and Angiosperms
Click here to know more about the Plant
Kingdom
26. All the heterotrophic,
eukaryotic and multicellular
organisms are included in the
Kingdom Animalia
They lack a cell wall
Find more details about the
Animal Kingdom here
27. NOTE
Some of the acellular organism and lichens, which
are not classified in the five-kingdom classification
by Whittaker are the following
29. Dmitri Ivanowsky gave the name “virus” to the causal organism of tobacco mosaic disease (TMV)
Beijerinek called the fluid extracted from diseased plants of tobacco, “Contagium vivum
fluidum” and observed it as being infectious to healthy plants
Stanley crystallised TMV (tobacco mosaic virus) for the first time
They are acellular containing nucleic acid core (either DNA or RNA), which is surrounded by a
protein coat called the capsid
Viruses use the host machinery to multiply inside the host cell, they exist in a crystalline form
outside the host cell
They are obligate parasite and cause various diseases in plants and animals, e.g. common cold,
AIDS, polio, mumps, measles, chickenpox, etc. in animals and various mosaic diseases in plants
such as tobacco, cucumber, tomato, etc. leaf curling, yellowing of vein, etc.
Viruses that infect plants have single-stranded RNA
Bacteriophages, viruses infecting bacteria have double-stranded DNA
31. T.O Diener (1971) discovered a new infectious agent
that was smaller than viruses. It was viroid. The
viroid caused potato spindle tuber disease. It
lacked the protein coat around the genetic
material RNA.
32. VIROIDS
They are the smallest infectious
agents found. They consist of
nucleic acid but lack a protein coat
Diener discovered viroids as a
causative agent of potato spindle
tuber disease, that was a free RNA
34. PRIONS
They contain abnormally folded proteins and have a
size similar to viruses
They can change the shape of normal proteins by
transmitting their misfolded proteins
They cause many neurodegenerative diseases, e.g.
bovine spongiform encephalopathy (BSE) in cattle
and Cr-Jacob disease in humans
36. LICHENS
They are a symbiotic, mutually beneficial
association of algae (phycobiont) and
fungi (mycobiont). The alga is
autotrophic and provides food, whereas
the fungus provides protection and
shelter
Lichens do not grow in polluted areas so
they are a good pollution indicator
Click to add text
