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Question

Single stranded RNA plant viruses are


A
Turnip yellow mosaic virus
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B
Potyvirus
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C
Alfalfa mosaic virus
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D
All of the above
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Solution

The correct option is D All of the above
Turnip yellow mosaic virus is an isometric tymovirus with ssRNA; it affects plants of Brassica family that includes cabbage, cauliflower and broccoli. Potyvirus genus includes ssRNA viruses that have a broad host range and causes mosaic disease making mosaics of yellow patches on leaves. Alfalfa mosaic virus is ss RNA virus and is also known as Lucerne mosaic virus or Potato calico virus. It causes necrosis and yellow mosaics on a large number of plants. Thus, the correct answer is option D.

Biology

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