(B) Viroids are infectious agents that are smaller than viruses. They consist solely of a short strand of circular,single-stranded $RNA$ without a pro

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(B) Viroids are infectious agents that are smaller than viruses. They consist solely of a short strand of circular,single-stranded $RNA$ without a protein coat (capsid). Unlike viruses,they do not contain $DNA$ or proteins. Therefore,the correct answer is $RNA$.

Class 11 Biology Biological Classification Viruses, Viroids, Prions and Lichens

Easy

Which nucleic acid is present in the structure of a viroid in a stranded form?

A
$DNA$
B
$RNA$
C
$ATP$
D
None of these

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Class 11

Biology Questions

Chapter

Biological Classification

Subtopic

Viruses, Viroids, Prions and Lichens

Which of the following structures is involved in the sexual reproduction of lichens?

Medium

View Solution

Match the following columns.

Column $I$ Column $II$

$(A)$ $DJ$ Ivanowsky $(i)$ Viroids

$(B)$ $MW$ Beijerinck $(ii)$ Crystallised virus

$(C)$ $WM$ Stanley $(iii)$ Contagium vivum fluidum

$(D)$ $TO$ Diener $(iv)$ Mosaic disease of tobacco

Column $I$	Column $II$
$(A)$ $DJ$ Ivanowsky	$(i)$ Viroids
$(B)$ $MW$ Beijerinck	$(ii)$ Crystallised virus
$(C)$ $WM$ Stanley	$(iii)$ Contagium vivum fluidum
$(D)$ $TO$ Diener	$(iv)$ Mosaic disease of tobacco