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प्रश्न
Discuss natural selection and artificial selection. What are the implications of the latter on the process of evolution?
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उत्तर
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in heritable traits of a population over time.
Artificial selection is the intentional breeding of plants or animals. Selective breeding is a technique used when breeding domesticated animals, such as dogs, pigeons or cattle.
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संबंधित प्रश्न
How has the mutation breeding helped in improving crop varieties? Give one example where this technique has helped.
Name the following:
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Which one of the following crop varieties correct matches with its resistance to disease?
| Variety | Resistance to disease |
| a) Pusa Komal | Bacterial blight |
| b) Pusa Sadabahar | White rust |
| c) Pusa Shubhra | Chilli mosaic virus |
| d) Brassica | Pusa swarnim |
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Give any four advantages of mutation breeding.
Shakti, Rattan and protina are three important lysine-rich varieties of:
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Give few examples of biofortified crops. What benefits do they offer to the society?
Write two varieties of sugarcane having high sugar content.
Give a reason for the following:
The continuous inbreeding of crops may lead to reduced fertility and productivity. However, the self-pollinated crops do not show the ill-effects of inbreeding.
