Question

Q21. Name one plant disease caused by virus and its mode of transmission.
Q22. How can we control plant diseases?
Q23. Name one plant disease caused by fungi and its mode of transmission.

Answer 1

Answer:

transmits Beet necrotic yellow vein virus.

Explanation:

Transmission of the virus takes place when they become associated with the plant roots. Examples include Polymyxa graminis, which has been shown to transmit plant viral diseases in cereal crops and Polymyxa betae which

Answer 2

21. The plant disease called yellow vein mosaic of okra is caused by a virus. It is transmitted through insects.

22. Chemical control (insecticides, fungicides, nematocides etc.) or biological control (involves the use of organisms other than humans to reduce or prevent infection by a pathogen, example : green manure like alfalfa or marigold etc.)

23. The plant disease called rust of wheat is caused by fungi. It is transmitted through air and seeds.

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