Which of the following situations correctly describes the similarity between an angiosperm egg and a human egg?
1. | Eggs of both are formed only once in a lifetime |
2. | Both the angiosperm egg and human egg are stationary |
3. | Both the angiosperm egg and human egg are mobile |
4. | Syngamy in both results in the formation of zygote |
1. | ii and iv | 2. | iv only |
3. | iii and iv | 4. | i and iv |
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Choose the correct statement from the following:
1. | Dioecious (hermaphrodite) organisms are seen only in animals. |
2. | Dioecious organisms are seen only in plants. |
3. | Dioecious organisms are seen in both plants and animals. |
4. | Dioecious organisms are seen only in vertebrates. |
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There is no natural death in single-celled organisms like Amoeba and bacteria because:
1. They cannot reproduce sexually
2. They reproduce by binary fission
3. Parental body is distributed among the offspring
4. They are microscopic
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Which of the following is a post-fertilisation event in flowering plants?
1. Transfer of pollen grains
2. Embryo development
3. Formation of flower
4. Formation of pollen grains
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The number of chromosomes in the shoot-tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be:
1. 20
2. 10
3. 40
4. 15
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The process of sexual reproduction which involves meiosis and syngamy is:
1. | Apomixis | 2. | Amphimixis |
3. | Agamospermy | 4. | Diplospory |
Grafting is not successful in monocots but is successful in dicots because they have:
1. Vascular bundles arranged in a ring
2. Cambium for secondary growth
3. Vessels with elements arranged end to end
4. Cork cambium
A scion is grafted on a stock. The quality of fruits produced will depend upon the genotype of:
1. Scion
2. Stock
3. Both 1. and 2.
4. None of the above
A prominent Indian botanist noted chiefly for his invention of the technique of test-tube fertilization of angiosperms is:
1. | Panchanan Maheshwari | 2. | M. S. Swaminathan |
3. | Gurdev Khush | 4. | Y. Subbarow |
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Consider the two statements:
I: | Lifespan of living organisms are correlated with their body size |
II: | Almost always, larger the body size more will be the lifespan |
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. I is correct and II is incorrect.
4. Both I and II are incorrect.
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