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Biology Biological Classification Skill Builder Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

T.O. Diener discovered a new infectious agent, smaller than virus and named them as prions.

Viroids lack the protein coat and made of only free RNA

The RNA of viroids is of high molecular weight

Lichens are very good pollution indicators as they grow only in polluted areas.

Text Solution

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The correct answer is:

Viroids are smaller than viruses and consist solely of a short strand of circular, single-stranded free RNA.

• Unlike viruses, they lack a protein coat (capsid).

• They were discovered by T.O. Diener in 1971 while investigating potato spindle tuber disease.

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