A) tobacco mosaic
B) tulip yellow mosaic
C) cauliflower mosaic
D) potato spindle mosaic
Correct Answer: D
Solution :
Viroids are the smallest self-replicating particles which were discovered by Diener (1971). Viroids are infectious RNA panicles which are devoid of protein coat. Viroids are known to cause diseases (some 20) in plants only, eg, potato spindle mosaic chrysanthemum stunt. Animal or human. infection is not known.
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