Q. No.Today, all our major food crops are derived from:
1. Wild varieties
2. Domesticated varieties
3. Genetically modified varieties
4. Plant tissue culture
1. Wild varieties
2. Domesticated varieties
3. Genetically modified varieties
4. Plant tissue culture
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Cross hybridisation among the selected parents is frequently used for the improvement of crop plants. Which of the following is not a shortcoming of the process?
| 1. | The combination of desired characters may always not be possible |
| 2. | It can be a tedious and time-consuming process |
| 3. | Undesirable characters may get introduced |
| 4. | The number of progeny is very limited |
Better yielding semi-dwarf varieties of rice developed in India are:
1. Sonalika and KalyanSona
2. IR – 8
3. Taichung native – 1
4. Jaya and Ratna
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Resistance to the yellow mosaic virus in bhindi (Abelmoschus Esculentus) was possible by:
| 1. | Conventional hybridization | 2. | Mutations |
| 3. | Genetic engineering | 4. | Tissue culture |
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Breeding crops with higher levels of vitamins and minerals, or higher protein and healthier fats is called:
| 1. | Bioremediation | 2. | Biofortification |
| 3. | Food adulteration | 4. | Biomagnification |
Any part of a plant taken out and grown in a test tube under sterile conditions in special nutrient media for generating new plants is called:
| 1. | Implant | 2. | Explant |
| 3. | Supplant | 4. | Plantlet |
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The management of animals for milk and its products for human consumption is called:
| 1. | Animal breeding | 2. | Dairying |
| 3. | Domestication | 4. | Animal husbandry |
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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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There are several species of honeybees that can be reared. From the options given below identify the species reared in India:
| 1. | Apisindica | 2. | Apisdorsata |
| 3. | Trigonairidipennis | 4. | Apismellifera |
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Classical plant breeding involves:
| 1. | Crossing or hybridization of pure lines and hardening |
| 2. | Crossing or hybridization of wild varieties and artificial selection |
| 3. | Crossing or hybridization of wild varieties and inbreeding |
| 4. | Crossing or hybridization of pure lines and artificial selection |
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