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Which of the following plant diseases is caused by a virus?
1. Barley yellow dwarf
2. Aster yellows
3. Curly top of sugar beets
4. All the above 

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Correct Answer - Option 4 : All the above 

The correct answer is All the above.

  • Many kinds of plants are infected with viruses and show no symptoms.
    • Such infections are referred to as being latent. Some viruses, such as cucumber mosaic virus (CMV) and cowpea mosaic virus (CPMV), occur as a complex of multiple component particles, each containing different nucleic acid cores.

  •  All types of living organisms including animals, plants, fungi, and bacteria are hosts for viruses, but most viruses infect only one type of host.
    • Viruses cause many important plant diseases and are responsible for losses in crop yield and quality in all parts of the world.
    • Numerous viruses infect plants, however, none of them so far is known as a pathogen to animal and human beings.
    • Only three families, Bunyaviridae, Rhabdoviridae, and Reoviridae contain viruses known to infect plants, animals, and humans.

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