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प्रश्न
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.
उत्तर
Preservation of the seeds of the cultivated variety and its wild varieties helps in making a good germplasm collection. Many high-yielding and disease-resistant varieties of wheat, rice and maize have been produced by selective breeding of plants. This could be possible because of a better germplasm collection.
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संबंधित प्रश्न
In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
(a) White rust
(b) Leaf and stripe rust
(c) Black rot
(d) Jussids
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yiel.
What is heterosis?
Answer each question in ‘One’ sentence only:
Define stock and scion.
Answer the following question.
How did plant breeding techniques help north Indian farmers to develop cane with desired characters?
Give an account of mutation breeding with examples.
In hybridization experiments 'true breeding' means off-springs show ____________.
Use of certain chemicals and radiation to change the base sequences of genes of crop plants is termed ______.
33 percent of India’s Gross Domestic Product comes from ______.
Discuss the importance of testing of new plant varieties in a geographically vast country like India.
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 |
