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Virus

Which of the ...

Question

Which of the following virus is devoid of protein coat and their body is constituted by only RNA?

A

Tobacco mosaic virus (TMV)

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B

Potato spindle tuber virus (PSTV)

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C

Polyoma virus

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D

Mumps virus

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Solution

The correct option is B Potato spindle tuber virus (PSTV)
Potato spindle disease is caused by viroid. Viroids lack protein coat and have RNA as the genetic material. Thus, they have low molecular weight RNA which is infectious. It is known to be smallest plant pathogen. Thus, the correct answer is option B.

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Q. Match column I with column II and select the correct option from the given codes.

	Column I		Column II
A.	Plant virus	(i)	Kuru disease
B.	Animal virus	(ii)	Potato spindle tuber
C.	Viroids	(iii)	Polio
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