| Subtopic | NEET Frequency | Question Format | Key Trap | Strategy |
|---|---|---|---|---|
| Virus — DNA or RNA | Very High (almost every year) | "Viruses contain..." / "Which is NOT a characteristic?" | Students say "both" — viruses have ONLY one type | Remember: "One nucleic acid per virus" — DNA viruses (phage, Adeno) vs RNA viruses (TMV, HIV) |
| Fungi cell wall & energy storage | High (2-3 times per 5 years) | "Cell wall of fungi is made of..." / "Fungi store energy as..." | Confusing with cellulose (plant) for wall; starch for storage | Fungi = Chitin wall + Glycogen storage (both different from plants) |
| Diatomaceous earth | High | "Diatomaceous earth is formed by..." | Confusing diatoms with other algae | Diatoms = Chrysophytes = siliceous frustules = diatomaceous earth |
| Lichen components & bioindicator | High | "Phycobiont is..." / "Lichens are sensitive to..." | Confusing phycobiont with mycobiont; confusing with other pollutants | Phyco = photo = alga; Myco = mycology = fungus; = sulphur dioxide from burning fossil fuels |
| Viroid discovery | Medium | "Viroids were discovered by..." | Confusing with Ivanowsky (TMV) or Pasteur | T.O. Diener = viroids (1971); Ivanowsky = TMV (1892); Pasteur = rabies |
| Mycoplasma unique feature | Medium | "Which organism lacks cell wall?" | Not linking Mycoplasma to Monera | Mycoplasma = Monera (prokaryote) despite having no cell wall |
| Cyanobacteria classification | Medium | "Cyanobacteria belong to which kingdom?" | Placing in Plantae/Protista due to "algae" name | Cyanobacteria = prokaryotes = Kingdom Monera |
| Heterocysts function | Medium | "Heterocysts are associated with..." | Confusing with akinetes (resting spores in cyanobacteria) | Heterocysts = fixation; Akinetes = resting spores; both in cyanobacteria |
| Protozoan locomotion types | Medium | "Match the following: locomotion type to organism" | Mixing Sporozoa (non-motile) with Sarcodina (pseudopodia) | PACS: Pseudopodia-Amoeba, Cilia-Paramoecium, Sporozoa-still, flagella-Trypanosoma |
| Archaebacteria vs Eubacteria | Medium | "Which feature distinguishes archaebacteria?" | Assuming all bacteria have peptidoglycan | Archaebacteria LACK peptidoglycan — key distinguishing feature |
| Prion diseases | Low–Medium | "Mad cow disease is caused by..." | Assuming a viral or bacterial cause | Prions = proteins only, no nucleic acid — Prusiner Nobel Prize 1997 |
| Fungi classification (spore types) | High | "Match fungi class to spore type" | Mixing up ascospore (Ascomycetes) with basidiospore (Basidiomycetes) | Asco-Ascospore-Asci; Basidio-Basidiospore-Basidia; Phyco-Zygospore; Deutero-Conidia only |
| Euglena nutrition type | Medium | "Euglena is described as..." | Saying purely autotrophic or purely heterotrophic | Mixotrophic = both; pellicle not cell wall |
Part of CL-01 — Biological Classification
PYQ (Previous Year Question) Analysis — Biological Classification
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