Which of these infections are caused by a viroid

Cauliflower mosaic

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Potato spindle mosaic

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Tobacco mosaic

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Tulip yellow mosaic

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Solution

The correct option is B Potato spindle mosaic
Viroids are the smallest infectious pathogens which are composed of circular, single-stranded RNA without a protein coat. The Potato spindle tuber viroid (PSTVd) was the first viroid to be identified which causes potato spindle mosaic disease. PSTVd is a small, circular RNA molecule. The natural hosts of PSTVd are potatoes and tomatoes. So the correct answer is 'potato spindle mosaic'.

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