CHAPTER 2 - BIOLOGICAL CLASSIFICATION. K C Meena PGT Biology KVS
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1 CHAPTER 2 - BIOLOGICAL CLASSIFICATION K C Meena PGT Biology KVS
2 Biological classification The process of grouping living organisms into convenient categories based on simple characters is known as Biological classification. Two kingdom classification. Plants. (autotrophs, cell wall, do not move) Animals (heterotrophus, no cell wall, can move) Linnaeus - plantae & Animalia Later found two kingdom classification was not sufficient because in that 1. Prokaryotes & Eukaryotes were grouped together. 2. Heterotrophs & Autotrophs were together. 3. No difference between unicellular and multicellular 4. Simple organisms were placed along with higher organism.
3 Five kingdom classification. (R.H Whittaker 1959) Main criteria for classification: Complexity of cell structure (prokaryotes/ eukaryote ) Body organization (unicellular/ multicellular) Mode of nutrition (autotrophic / heterotrophic / holozoic) Life style ( producers / consumers / decomposers) Phylogenic relationships (revolutionary history) Five kingdoms are 1. Kingdom Monera (bacteria ) prokaryotic unicellular 2. Kingdom Protista ( amoeba ) eukaryotic unicellular 3. Kingdom Fungi - multicellular eukaryotic 4. Kingdom Plantae - multicellular eukaryotic 5. Kingdom Animalia multicellular eukaryotic
4 Kingdom - Monera (eg. Bacteria ) Habitats- omnipresent Grouped in to 4 groups based on their shape. 1. Cocus (spherical) 2. Bacillus (rod) 3. Vibrio (comma) 4. Spirillum (spiral) Mode of nutrition autotrophs and heterophs. Kingdom Monera includes; 1. Archaebacteria 2. Eubacteria (Cyanobacteria, Chemosynthetic and Heterotrophic) 3. Mycoplasma
5 Archaebacteria Harsh habitats Halophiles (saline) Thermoacidophiles (hot spring), Methanogens (gut of ruminants) Eubacteria True bacteria - Rigid cell wall - Motile flagellum Autotrophic bacteria - Cyanobacteria (BGA) have chlorophyll a unicellular, colonial/ filamentous. Marine /terrestrial habitat/ gelatinous sheath Form blooms - can fix nitrogen in heterocysts. Eg. Nostoc, Anabaena.
6 Chemosynthetic bacteria Oxidise nitrates, nitrites and ammonia release energy (ATP) help in Recycling of nutrients ( eg. Pseudomonas, nitrobacter ) Heterotrophic bacteria Decomposers making curd from milk, antibiotics, nitrogen fixing (Rhizobium ) some are pathogenic ( cause diseases ) cholera, T.B, diarrhea. Reproduction by binary fission, spore / sexual reproduction. Mycoplasma. No cell wall smallest living cell. Anaerobic pathogenic in animals and plants.
7 Kingdom -Protista Unicellular Eukaryotic aquatic Flagella / cilia - Reproduce sexually / asexually Chrysophyta : Planktons diatoms and golden algae ( desmids ) Fresh water/ marine Microscopic photosynthetic In diatoms, cell wall is indestructible (silica )form diatomaceous earth, its being gritty used for polishing, fitration of oil and syrups. Chief producers in oceans. (a) Euglena (b) Paramoecium
8 Dinoflagellates. Marine photosynthetic, yellow, green, blue or red pigments - Cell wall is cellulosic have 2 flagella - Red dionflagellate (Gonyaulax ) forms red tides and toxins are released. Euglenoid eg. Euglena Fresh water stagnant water no cell wall but protein rich layer is present, called pellicle. Pellicle is flexible with flagella they are Myxotrophic, because Photosynthetic (in light) Heterotrophs (when no light). Myxotrophs Mixture of both autotrophs and heterotrophs
9 Protozoans Heterotrophs predators/ parasites There are 4 major groups; Amoeboid protozoans. Fresh water, sea and moist soil -pseudopodia marine forms have silica shells. Entamoeba (parasite) cause Amoebic dysentery Flagellated protozoans - free living / parasites have flagella parasites cause diseases Sleeping sickness (Trypanoroma) is a parasite of flagellated protozoans. Ciliated protozoans aquatic cilia, cavity gullet eg. Paramoecium. Sporozoans Spore stage in their life cycle. Plasmodium causes malarial fever.
10 Kingdom - Fungi Multicellular eukaryotic heterotrophic - cosmopolitan - grow in warm and humid places. Fungi are filamentous with long, slender thread like Hyphae and the net work of hyphae is known as Mycelium They can be septate or non septate (aseptate) Multinucleated cytoplasm (coenocytic hyphae) Cell wall is made up of chitin. Parasitic/ symbionts (Lichens and Mycorrhizae) Symbionts of algae and fungi (Lichens) and Pine trees roots and fungi (Mycorrhizae) on roots to absorb water. Agaricus
11 Reproduction by fragmentation, fission, buddin. Asexual reproduction by oospores, ascospores, basidiospores. Sexual reproduction steps. 1. Plasmogamy 2. Karyogamy and 3. Meiosis in zygote result in haploid spores dikaryon Dikaryophase Zygote (2n diploid) haploid Spores (n haploid))
12 Based on morphology of mycelium mode of spore formation, fruiting bodies, there 4 classes; 1. Phycomycetes 2. Ascomycetes 3. Basidiomycetes 4. Deuteromycetes 1. Phycomycetes : Aquatic decaying wood mycelium is aseptate coenocytic asexual reproduction by zoospores (motile ) / aplanospores ( non motile ) Eg. Rhizopus, mucor.
13 2. Ascomycetes : (Sac fungi) Multicellular (penicillium ) / Unicellular ( yeast ) Saprophytic decomposers parasitic coprophilous Mycelium is branched and septate asexual spores are called conidia Sexual spores are called ascospores. Eg. Aspergillus, Neurospora 3. Basidiomycetes : (Eg. Mushroom/ bracket fungi/ puffballs) Grow in soil, logs, tree stumps, in plant bodies as parasitic (as rust and smuts) Mycelium is branched and septate Reproduction by fragmentation Dikaryon basidium karyogamy Eg. Agaricus (mushroom)
14 4. Deuteromycetes : Imperfect fungi mycelium is septate and branched. Only asexual reproduction by conidial spores Saprophytes / parasitic / decomposers Help in Mineral cycling Eg. Trichoderma, Alternaria
15 Kingdom - Plantae Autotrophs size varies from herbs to tall trees. There are different groups; Algae Bryophytes Pteridophytes Gymnosperms Angiosperms Monocotyledons and Dicotyledons 5.Kingdom Animalia : Heterotrophs locomotory holozoic / saprophytic / parasitic cosmopolitans. It consists of two subkingdom Invertebrata with 9 Phylum and Phylum Vertebrata (Chordata) with 5 Classes.
16 Virus: Pasteur coined the term virus, which means Venom / poison. It is made of a outer protein coat and a centre genetic material (RNA / DNA). A virus is a nucleoprotein and the genetic material is infectious. Virus that infect plants have single stand RNA and those infect animals have either single or double RNA or double stranded DNA. Bacteriophages are viruses that infect the bacteria. Viruses cause disease like mumps, small pox, herpes, influenza and AIDS. In plants the symptoms can be mosaic formation, leaf rolling, and curling, yellowing, dwarfing and stunted growth. (a) Tobacco Mosaic Virus (TMV) (b) Bacteriophage
17 Viroids T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. It has only a free RNA and lacked the protein coat, so named as viroid. Lichens Symbiotic association between algae and fungi. Phycobiont is algal component, which prepare food for fungi and Mycobiont is a fungal component, which provide shelter and absorb mineral nutrients and water for its partner.
18 Thanking you
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Scan the adjacent QR code or visit to download Hints for relevant questions and Evaluation Test in PDF format.
Written in accordance with the latest MHT-CET Paper Pattern which includes topics based on Std. XII Sc. and relevant chapters of Std. XI Sc. (Maharashtra State Board) MHT-CET TRIUMPH BIOLOGY MULTIPLE CHOICE
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