- 1(current)
Q. No.Consider the following statements regarding inbreeding in animal husbandry:
| I. | Inbreeding refers to the mating of more closely related individuals within the same breed for 4-6 generations. |
| II. | Inbreeding increases homozygosity and is necessary if we want to evolve a pure line in any animal. |
| III. | Inbreeding exposes harmful recessive genes that are eliminated by selection and helps in the accumulation of superior genes. |
| IV. | Continued inbreeding usually reduces fertility and even productivity, called inbreeding depression, which can be overcome by mating selected animals of the breeding population with unrelated superior animals of the same breed. |
The correct statements are:
| 1. | I, II and III only | 2. | II, III and IV only |
| 3. | I, II and IV only | 4. | I, II, III and IV |
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The main reason for the success of the green revolution was:
1. Improvement in the efficiency of chemical pesticides
2. Improvement in irrigation facilities
3. Equitable distribution of land among farmers
4. Development of HYV varieties
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The term ‘totipotency’ refers to the capacity of a:
1. cell to generate the whole plant
2. bud to generate the whole plant
3. seed to germinate
4. cell to enlarge in size
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The most important advantage of micropropagation is:
| 1. | production of virus free plants |
| 2. | rapid production of a large number of genetically identical superior plants |
| 3. | creation of somaclonal variations for effective germplasm collection |
| 4. | production of transgenic plants |
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The plantlets produced during plant tissue culture are called somaclones because:
| 1. | They can be produced in a very short span of time |
| 2. | They are the result of the somatic hybridization of two cells |
| 3. | The gametes develop parthenogenetically to produce genetically identical plantlets |
| 4. | They are genetically identical to the original plant from which they were grown |
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Somaclonal variations are:
| 1. | seen in plants that have been produced by plant tissue culture. |
| 2. | due to environmental factors and have no evolutionary advantage. |
| 3. | induced by mutations and are inherited. |
| 4. | not useful in plant breeding programs. |
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In micro-propagation, to obtain virus free plants, the best explants can be:
| 1. | Embryos | 2. | Anther |
| 3. | Meristem | 4. | Primary permanent tissues |
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The first step to achieve somatic hybridization in plants will be:
| 1. | growing individual cells into callus |
| 2. | fusion of two cells in the presence of polyethylene glycol |
| 3. | converting plant cells into protoplast by cellulase |
| 4. | growing plant cells in cytokinin |
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Q. No.
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