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प्रश्न
Discuss briefly the technology that made us self-sufficient in food production.
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उत्तर
Plant breeding is the purposeful manipulation of plant species in order to create desired plant types that are better suited for cultivation, give better yields and are disease resistant. With advancements in genetics, molecular biology and tissue culture, plant breeding is now increasingly being carried out by using molecular genetic tools.
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संबंधित प्रश्न
Identify ‘a’, ‘b’ and ‘c’ in the following table:
| S. No. | Crop | Variety | Insect Pests |
| 1. | Brassica | Pusa Gaurav | ‘a’ |
| 2. | Flat bean | Pusa Sem 2 Pusa sem 3 |
‘b’ |
| 3. | ‘c’ | Pusa Sawani Pusa A-4 |
Shoot and fruit borer |
Plant breeding technique has helped sugar industry in North India. Explain how.
How has mutation breeding helped in improving the production of mung bean crop?
Define the term water potential.
Definition and importance of Imbibition
Give a reason for the following:
Bagging is essential in artificial hybridisation.
In hybridization experiments 'true breeding' means off-springs show ____________.
If a diploid cell is treated with colchicine then it becomes:
The plant which is used for Studying hybrid vigour or heterocyst:
The biggest constraint of plant breeding is ______.
Match the columns-
| Column A | Column B | ||
| A. | Kalyan Sona | 1. | Rice |
| B. | Pusa sawani | 2. | Wheat |
| C. | IR - 8 | 3. | Okra |
Mutations in plant cells can be induced by ______
Lysine and tryptophan are ______.
The agriculture sector of India employs about ______.
Discuss the two main limitations of plant hybridization programme.
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?
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.
