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Question

Plant viruses have  as their genetic material.
  1. RNA and DNA
  2. RNA or DNA
  3. Only RNA
  4. Only DNA


Solution

The correct option is B RNA or DNA
Plant viruses can have DNA or RNA as the genetic material but never both.
  • The DNA/RNA could be double stranded or single stranded.
  • Gemini virus has single stranded DNA genome.
  • Tobacco mosaic virus has a single stranded RNA genome. Some reoviruses affecting plants, collectively called phytoreovirus have double stranded RNA as their genetic material.
  • Double stranded DNA is rarely seen in viruses affecting angiosperms. They are mostly seen in algal viruses.

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