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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
Which steps would you follow to develop a new variety of crop plant by selective breeding?
Identify 'A', 'B', 'C' and 'D' in the given table.
| Crop | Variety | Resistance to disease |
| A | Himgiri | Leaf rust |
| Cauliflower | Pusa Shubhra | B |
| Brassica | Pusa Swarnim | C |
| Cowpea | D | Bacterial blight |
Definition and importance of Imbibition
Column - I contains names of host plant while Column - II contains names of viral dieases. Find the correct option.
| Column-I | Column-II | ||
| (I) | Banana | (p) | little leaf |
| (II) | Sugarcane | (q) | bunchy top |
| (III) | Papaya | (r) | leaf roll |
| (IV) | Brinjal | (s) | grassy shoot |
| (t) | leaf curl |
Polyploidy leads to the rapid formation of new species because:
Lysine and tryptophan are ______.
33 percent of India’s Gross Domestic Product comes from ______.
In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with a suitable example.
Give few examples of biofortified crops. What benefits do they offer to the society?
Given below are the steps involved in plant breeding program. Identify the correct sequence of these steps.
i. collection of variabilities
ii. hybridization
iii. evaluation and selection of parents
iv. testing, release and commercialization of new cultivars.
v. selection and testing of superior recombinants.
