Most Common Misconceptions and NEET Traps

Trap 1 — Virus nucleic acid (Most common NEET trap): Students write "viruses contain both DNA and RNA." This is wrong. Any given virus particle contains EITHER DNA OR RNA — never both. DNA viruses: bacteriophage, Adenovirus, Herpesvirus. RNA viruses: TMV, HIV, Influenza, Rabies.

Trap 2 — Fungi energy storage: Fungi store glycogen, not starch. Because fungi superficially resemble plants, students incorrectly assign plant-type biochemistry. Fungi are biochemically closer to animals (both store glycogen).

Trap 3 — Cyanobacteria kingdom: Their old name "blue-green algae" misleads students into placing them in Plantae or Protista. Cyanobacteria are prokaryotes — they belong to Kingdom Monera, not Protista or Plantae.

Trap 4 — Euglena cell wall: Euglena has a pellicle (flexible proteinaceous covering), not a cellulose cell wall. This is why it is in Protista, not Plantae, despite being photosynthetic.

Trap 5 — Archaebacteria cell wall: Students assume all bacteria have peptidoglycan. Archaebacteria cell walls lack peptidoglycan — this is a defining feature differentiating them from Eubacteria.

Trap 6 — Mycoplasma classification: Students assume absence of cell wall = eukaryote. Mycoplasma is a prokaryote (Monera) despite lacking a cell wall.

Trap 7 — Prion composition: Students expect infectious agents to have nucleic acid. Prions are the exception — they are purely protein-based (misfolded PrPSc); no DNA or RNA involved.

Trap 8 — Lichen pollution type: Lichens are bioindicators of AIR pollution (specifically $SO_{2}$), not water pollution.

Trap 9 — Diatom cell wall material: Diatom cell walls are silica ($SiO_{2}$ frustules), not cellulose. Students generalise "algae = cellulose."

Trap 10 — Plasmodium confusion: Two entirely different organisms share this name: Plasmodium the malaria-causing protozoan (Sporozoa) and the plasmodium body stage of slime moulds (Physarum). Read the question context carefully.