Viruses, Viroids, Prions and Lichens — NEET Biology Questions

Practice 20 questions on Viruses, Viroids, Prions and Lichens from Biological classification (NCERT Class 11, Chapter 2). Free samples below — get all 20 in the app.

20 Questions Biological classification Class 11

Sample Questions — Viruses, Viroids, Prions and Lichens

Try 5 questions below from Viruses, Viroids, Prions and Lichens. Get all 20 in the MedicNEET app.

MCQ
Why are lichens sensitive to air pollution?
  • A. Lichens are bioindicators and cannot tolerate SOâ‚‚ and pollutants
  • B. Their algal partner requires toxins
  • C. Their fungal partner degrades in presence of COâ‚‚.
  • D. They contain prions
✅ Correct Answer: A
Lichens disappear in polluted environments due to their sensitivity to sulphur dioxide.
MCQ
Which disease is caused by a viroid?
  • A. Potato spindle tuber
  • B. Hepatitis B
  • C. Influenza
  • D. AIDS
✅ Correct Answer: A
Viroids are RNA particles discovered to cause this disease in plants.
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MCQ
Which type of nucleic acid is found in bacteriophages?
  • A. dsDNA
  • B. dsRNA
  • C. ssRNA
  • D. Both DNA and RNA
✅ Correct Answer: A
Bacteriophages commonly contain double-stranded DNA.
MCQ
Genetic material in plant viruses is mostly:
  • A. DNA
  • B. RNA
  • C. Both DNA and RNA
  • D. No genetic material
✅ Correct Answer: B
Most plant viruses carry RNA, unlike animal viruses that usually carry DNA.
MCQ
How do prions cause disease despite lacking nucleic acids?
  • A. They block DNA and hijack the host machinery
  • B. Their abnormal proteins induce misfolding in host proteins
  • C. They destroy ribosomes and prevent further protein synthesis
  • D. They inhibit mRNA translation
✅ Correct Answer: B
Misfolded prions cause other proteins to misfold, disrupting brain function.

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