Biological Classification carries 7.1 of 100 Botany marks in NEET by past-paper share: 56 of the 793 tagged NEET Botany PYQs in the ViJEEta bank (NEET 2013–2026). It ranks 5 of 21 Botany chapters.
How the weight is computed: this chapter's tagged NEET PYQs divided by all tagged NEET Botany PYQs in the bank (56 of 793), times 100, with repeated questions counted once. The bank does not store the year of each NEET question, so none is printed. Computed from the bank at build time. Updated 19 Oct 2026.
16 facts the paper keeps asking, each with how it is asked. Copy it onto one page of your notebook: that page is this chapter's handbook.
R.H. Whittaker (1969) gave five kingdoms (Monera, Protista, Fungi, Plantae, Animalia) based on cell structure, body organisation, nutrition, reproduction and phylogenetic relationships.
Asked as: "Which was NOT a criterion of Whittaker's system?" or "Five kingdom classification was proposed by / in the year?"
Cell walls: Monera noncellulosic (polysaccharide + amino acid), Fungi chitin, Plantae cellulose, Animalia none. Exception: Mycoplasma has no wall at all, is the smallest living cell and survives without oxygen.
Asked as: match the kingdom to its wall material, or "the smallest living cell lacking a cell wall is?"
Archaebacteria live in harsh habitats: halophiles (salty), thermoacidophiles (hot springs), methanogens (marshes). Their different cell wall lets them survive there. Methanogens in the gut of cows and buffaloes make methane (, biogas) from dung.
Asked as: match the archaebacterium to its habitat, or "biogas from cattle dung is produced by?"
Cyanobacteria (blue-green algae) have chlorophyll like plants and form blooms in polluted water. Nostoc and Anabaena fix in heterocysts.
Asked as: "Nitrogen fixation in Nostoc occurs in?" heterocysts
Chrysophytes include diatoms and desmids. Diatom walls are two overlapping silica shells (soap-box fit) that leave diatomaceous earth, used in polishing and filtration. Diatoms are the chief producers of the oceans.
Asked as: "Diatomaceous earth is formed from walls containing?" silica
Dinoflagellates are mostly marine, with stiff cellulose plates on the wall; most have two flagella (one longitudinal, one transverse in a furrow between the plates). Gonyaulax causes red tides whose toxins can kill fish.
Asked as: "Red tides are caused by?" Gonyaulax (dinoflagellate)
Euglenoids (Euglena) have a protein-rich pellicle instead of a cell wall and two flagella (one short, one long). They are photosynthetic in light and heterotrophic in the dark, with pigments identical to higher plants.
Asked as: "Euglena has no cell wall; its flexible covering is?" pellicle
Slime moulds are saprophytic protists that form a plasmodium spreading over several feet. Their fruiting bodies bear spores with true walls that are extremely resistant and dispersed by air.
Asked as: "The plasmodium of slime moulds is…" or "slime mould spores are dispersed by?"
Protozoans are all heterotrophs, in four groups: amoeboid (Amoeba, Entamoeba), flagellated (Trypanosoma, sleeping sickness), ciliated (Paramoecium, gullet), sporozoans (Plasmodium, malaria).
Asked as: match the protozoan to its group or disease
Phycomycetes have aseptate, coenocytic mycelium, endogenous zoospores or aplanospores in a sporangium, and a zygospore. Examples: Mucor, Rhizopus, Albugo (on mustard).
Asked as: "White spots on mustard leaves are caused by?" Albugo, or "coenocytic mycelium is found in?"
Ascomycetes (sac fungi) have septate, branched mycelium. Conidia form exogenously on conidiophores; ascospores form endogenously in asci inside ascocarps. Examples: Penicillium, yeast, Aspergillus, Claviceps, Neurospora (used in genetics).
Asked as: "Neurospora, used in genetic work, belongs to?" Ascomycetes
Basidiomycetes have no sex organs. Plasmogamy is by fusion of somatic cells, giving a dikaryon ; karyogamy and meiosis in the basidium give exogenous basidiospores. Examples: Agaricus, Ustilago (smut), Puccinia (rust).
Asked as: "Number of basidiospores per basidium?" , or "dikaryophase is seen in?" asco- and basidiomycetes
Deuteromycetes (imperfect fungi) have only asexual/vegetative stages known and reproduce only by conidia. Many are litter decomposers. Examples: Alternaria, Colletotrichum, Trichoderma.
Asked as: "Why are they called imperfect fungi?" or "which one is a deuteromycete?"
Viruses: Ivanowsky (1892) worked on tobacco mosaic, Beijerinck (1898) coined "Contagium vivum fluidum", Stanley (1935) crystallised them (mostly protein). A virus has RNA or DNA, never both. Plant viruses generally carry ssRNA; bacteriophages usually carry dsDNA.
Asked as: match scientist to discovery, or "genetic material of TMV / bacteriophage is?"
Viroid (T.O. Diener, 1971) is free, low-molecular-weight RNA without a protein coat and causes potato spindle tuber disease. A prion is an abnormally folded protein that causes BSE (mad cow disease) and CJD in humans.
Asked as: "Viroids differ from viruses in lacking?" protein coat
Lichens are a mutually useful algae + fungus association: phycobiont (alga, autotrophic) and mycobiont (fungus, heterotrophic). They are good pollution indicators because they do not grow in polluted areas.
Asked as: "Phycobiont and mycobiont refer to?" or "which organisms indicate air pollution?"
Endogenous vs exogenous spores. Sporangiospores (Phycomycetes) and ascospores (in the ascus) form INSIDE; conidia (on conidiophores) and basidiospores (on the basidium) form OUTSIDE.
8 real previous-year questions from this chapter, as printed in the paper, each with its worked solution. Answer the first one here with no sign-in.
Correct answer: Option D
Correct answer: Option A
Correct answer: Option B
Correct answer: Option A
Correct answer: Option C
Correct answer: Option B
Correct answer: Option A
Correct answer: Option C
All 8 topics, by tagged PYQs, then practice questions. Counted from the bank. Updated 19 Oct 2026.
| Topic | PYQs | Practice questions |
|---|---|---|
| Kingdom Monera | 18 | 127 |
| Kingdom Fungi | 12 | 160 |
| Kingdom Protista | 9 | 114 |
| Viruses, Viroids, Prions and Lichens | 9 | 73 |
| Classification Systems | 6 | 65 |
| Introduction to Kingdom Plantae and Animalia | 1 | 25 |
| Need for Classification | 1 | 11 |
| Miscellaneous Examples | 0 | 31 |
Unknown is not zero. Until you answer at least 3 graded questions in Biological Classification, ViJEEta shows – instead of a zero or a 50% default. Book exercises can raise chapter mastery up to 0.60, adaptive practice up to 0.75, and only a timed chapter test or mock can certify 0.80 and above.
Every chapter test is 25 questions. It starts at moderate difficulty and adapts after each saved answer. If you open a solution before answering, that attempt earns no credit, so your mastery stays honest.
Start the Biological Classification test