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प्रश्न
Suggest some of the features of plants that will prevent insect and pest infestation
उत्तर
Some of the features of plants that prevent insects and pest infestation are as follows:
- Hairy leaves are supposed to resist pest attacks, e.g. jassids do not attack cotton and leaf beetle does not attack wheat.
- The solid stem of wheat makes it resistant to stem sawflies.
- Nectar-less cotton varieties do not attract bollworms.
- High aspartic acid, low nitrogen and sugar content in maize lead to resistance to maize stem borers.
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संबंधित प्रश्न
Name the high-yielding semi-dwarf varieties of wheat selected and introduced in India in 1963.
(a) Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
(b) Identify 'a', 'b' and 'c' in the following table:
| 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 |
How has mutation breeding helped in improving the production of mung bean crop?
While studying the history of the domestication of various cultivated plants _______ were recognized earlier.
The biggest constraint of plant breeding is:
Sugarcane which grow in North India, and which do not grow in north India.
Fungicides and antibiotics are chemicals that ______.
What is meant by ‘hidden hunger’?
Discuss the importance of testing of new plant varieties in a geographically vast country like India.
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.
