Advertisements
Advertisements
प्रश्न
Give an account of mutation breeding with examples.
Advertisements
उत्तर
The mutation is a sudden heritable change in the genotype. In mutation breeding, desirable mutations are induced in crop plants with the use of physical or chemical mutagens.
- Natural (physical) mutagens are High temperature, high concentration of CO2, X rays, UV rays.
- Chemical mutagens are Nitrous acid, EMS (Ethyl- Methyl- Sulphonate), Mustard gas, Colchicine, etc.
- Seedlings or seeds are irradiated by CO-60, exposed to UV bulbs, X-ray machines, etc.
- Mutagens cause gene mutations and chromosomal aberrations.
- The treated seedlings are then screened for resistance to diseases/ pests, high yield, etc. e.g. Jagannath variety of rice, NP 836 variety of wheat (rust-resistant), Indore-2 variety of cotton (resistant to bollworm), Regina-II variety of cabbage (resistant to bacterial rot), etc.
APPEARS IN
संबंधित प्रश्न
Write a short note on ‘Mutational breeding’.
Give reason :
Emasculation is done in a flower which is selected as female parent.
In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
- White rust
- Leaf and stripe rust
- Black rot
- Jussids
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yield.
Name the scientists who Coined the term Diffusion Pressure Deficit
What are analogous organs? Describe with one example from the plant kingdom.
Mechanism of fast Speciation in crop plants is ______.
Match the columns-
| Column A | Column B | ||
| A. | Kalyan Sona | 1. | Rice |
| B. | Pusa sawani | 2. | Wheat |
| C. | IR - 8 | 3. | Okra |
What is meant by ‘hidden hunger’?
Mutations are beneficial for plant breeding. Taking an example, justify the statement.
Write two varieties of sugarcane having high sugar content.
