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प्रश्न
How the resistance in crops can be developed?
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उत्तर
- Development of morphological characters like hairy leaves in cotton and wheat develop vector resistance from jassids and cereal leaf beetle, respectively.
- Solid stem in wheat leads to resistance to stem borers.
- Biochemical characters provide resistance to insects and pests. For example, the high aspartic acid, and low nitrogen and sugar content in maize, lead to resistance against stem borers.
- The nectar-less cotton having smooth leaves develop resistance against bollworms.
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संबंधित प्रश्न
Name the high-yielding semi-dwarf varieties of wheat selected and introduced in India in 1963.
Enumerate four objectives for improving the nutritional quality of different crops for the health benefits of the human population by the process of "Biofortification".
What are analogous organs? Describe with one example from the plant kingdom.
Smooth leaved and necterless cotton varieties are NOT affected by ____________.
Give any four advantages of mutation breeding.
Breeding of crops with high levels of minerals:
Name a man-made cereal? Trace how it was developed and where is it used?
Give few examples of biofortified crops. What benefits do they offer to the society?
Mutations are beneficial for plant breeding. Taking an example, justify the statement.
Match the following:
| Sr. No. | Column I | Column II | |
| (i) | Eutrophication | (a) | A soil erosion |
| (ii) | Biomagnification | (b) | carbon monoxide, methane |
| (iii) | Particulate pollutant | (c) | Prevention of extinction |
| (iv) | Conservation | (d) | Dust, smog |
| (v) | Gaseous pollutants | (e) | Accumulation of nonbiodegradable substances |
| (vi) | Deforestation | (f) | Death of aquatic ecosystem |
