Consider the following two statements:
I: | In spite of having more than 70 percent of the world's livestock population, the contribution of India and China to the world's farm produce is only 25 percent. |
II: | The productivity per unit of cattle in these countries is very low. |
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true but II is false
4. Both statements are not true
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Today, all our major food crops are derived from:
1. Wild varieties
2. Domesticated varieties
3. Genetically modified varieties
4. Plant tissue culture
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Consider the following two statements:
I: | An effective germplasm collection is the prerequisite of any successful plant breeding programme. |
II: | Genetic variability is the root of any breeding programme. |
1. Both I and II are true and II explains I.
2. Both I and II are true but II does not explain I.
3. I is true but II is false.
4. I is false but II is true.
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A pure line plant:
1. | is defined as having only recessive alleles for the traits at all loci |
2. | breeds true and preserves the trait for many generations |
3. | is not susceptible to any diseases and is used as a parent in plant breeding experiments |
4. | can be produced by inbreeding amongst the endemic varieties only |
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Arrange the following steps of a plant breeding program in a correct chronological manner:
I. | Selection and testing of superior recombinants |
II. | Collection of variability |
III. | Cross hybridisation among the selected parents |
IV. | Evaluation and selection of parents |
V. | Testing, release, and commercialisation of new cultivars |
1. | II, IV, I, III, V | 2. | IV, I, II, III, V |
3. | II, IV, III, I, V | 4. | IV, III, II, I, V |
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I: | New cultivars produced by plant breeding are first evaluated in research fields and their performance is recorded under ideal fertiliser application, irrigation, and other crop management practices. |
II: | After evaluation in research fields, the new cultivars are tested in farmers’ fields for at least three growing seasons at several locations in the country. |
1. | Only I | 2. | Only II |
3. | Both I and II | 4. | Neither I nor II |
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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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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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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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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