Q. No.Consider the following statements:
I:
Self-pollination or selfing is the extreme form of inbreeding.
II:
Loss of vigor associated with inbreeding is inbreeding depression.
III:
Self-pollinated crops do not usually show the ill effects of inbreeding.
The correct statements are:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
2. Only I and III
3. Only II and III
4. I, II and III
Practically all hybrids of poultry and swine are produced by:
1. crossing inbred stocks
2. introduction of exotic breeds
3. crossing genetically similar parents
4. mutation breeding
The most important species of honeybee reared in India is:
| 1. | Apis indica | 2. | Apis mellifera |
| 3. | Apis dorsata | 4. | Apis florea |
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Identify the incorrectly matched pair:
| Column I | Column II | |
| 1. | Sonalika and Kalyan Sona | Improved varieties of wheat |
| 2. | Jaya and Ratna | Improved varieties of maize |
| 3 | Saccharum Barberi | Poor sugar content and yield |
| 4. | Saccharum officinarum | High sugar content and thick stems |
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Methylophilus methylotrophus is a source of:
| 1. | Bioinsecticide | 2. | Single cell protein |
| 3. | Thrombolytic | 4. | Clotting factors |
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In mung bean, resistance to yellow mosaic virus and powdery mildew was introduced by:
| 1. | Agrobacterium mediation | 2. | Somatic hybridization |
| 3. | Micropropagation | 4. | Mutation breeding |
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Consider the two statements:
| I: | Inbreeding is an important strategy in animal breeding experiments. |
| II: | It exposes recessive harmful genes that are eliminated by selection. |
| 1. | Both I and II are correct and II explains I. |
| 2. | Both I and II are correct but II does not explain I. |
| 3. | Only I is correct. |
| 4. | Both I and II are incorrect. |
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The best breeding method for animals that are below average in productivity in milk production is:
| 1. | Inbreeding | 2. | Out-crossing |
| 3. | Cross-breeding | 4. | Interspecific hybridization |
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Identify the row where the crop [Column I], its variety [Column II] and resistance to disease/pest [Column III] are all correctly matched:
|
COLUMN I |
COLUMN II |
COLUMN III |
|
|
1. |
Brassica |
Himgiri |
White rust |
|
2. |
Cowpea |
Pusa Komal |
Bacterial blight |
|
3. |
Flat bean |
Pusa Sem 2 |
Shoot and fruit borer |
|
4. |
Okra |
Pusa Gaurav |
Aphids |
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Conventional breeding is often constrained by the availability of a limited number of disease-resistance genes that are present and identified in various crop varieties or wild relatives. This is most commonly overcome by:
| 1. | Inducing mutations | 2. | Somaclonal variations |
| 3. | Genetic engineering | 4. | Plant introduction |
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