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Q.

Viroids discovered by Diener (1971) are infectious agents and cause diseases in plants only. They differ from viruses in being

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a

naked ssDNA molecules without protein coat

b

naked ssRNA molecule of 250-400 nucleotides without protein coat

c

naked DNA packaged with viral genome

d

satellite DNA packaged with viral genome

answer is B.

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Detailed Solution

Viroids contain only ssRNA without protein coat. It is circular RNA. 

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