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प्रश्न
In Brassica (rapeseed, mustard)........................ varietys is resistant to Aphids.
(a) Pusa A-4
(b) Pusa Gaurav
(c) Pusa Sawni
(d) . Pusa Shubra
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उत्तर
(B) Pusa Gaurav
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संबंधित प्रश्न
In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
- White rust
- Leaf and stripe rust
- Black rot
- Jussids
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yield.
Definition and importance of Imbibition
Answer each question in ‘One’ sentence only:
Define stock and scion.
Describe briefly various steps of plant breeding methods.
The biggest constraint of plant breeding is:
What is emasculation? Why and when is it done?
It is said, that diseases are spreading faster due to globalisation and increased movement of people. Justify the statement taking the example of H5N1 virus.
Discuss natural selection and artificial selection. What are the implications of the latter on the process of evolution?
Mutations are beneficial for plant breeding. Taking an example, justify the statement.
Discuss briefly the technology that made us self-sufficient in food production.
