Q. No.In animals exhibiting external fertilization:
| 1. | the offspring are less prone to predation |
| 2. | the reproduction is independent of water |
| 3. | there is synchrony between sexes for the release of gametes |
| 4. | the number of female gametes are highly reduced |
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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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Organisms relying completely on external fertilization are almost always likely to be found in:
1. Tropical forests
2. Moist environments
3. Aquatic habitats
4. Dry, arid conditions
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The process of sexual reproduction which involves meiosis and syngamy is:
| 1. | Apomixis | 2. | Amphimixis |
| 3. | Agamospermy | 4. | Diplospory |
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Given below are a few statements related to external fertilization. Choose the correct statements.
| i. | The male and female gametes are formed and released simultaneously. |
| ii. | Only a few gametes are released into the medium. |
| iii. | Water is the medium in a majority of organisms exhibiting external fertilization. |
| iv. | Offspring formed as a result of external fertilization have a better chance of survival than those formed inside an organism. |
| 1. | iii and iv | 2. | i and iii |
| 3. | ii and iv | 4. | i and iv |
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Consider the given statements:
| I. | Gemmules are asexual reproductive structures in sponges. |
| II. | In Bryophyllum, vegetative propagation takes place by leaf buds. |
| III. | Marchantia is monoecious and Chara is dioecious. |
The correct statements are:
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, and III |
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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
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 |
Choose the correct answer from the options given below:
| 1. | ii and iv | 2. | iv only |
| 3. | iii and iv | 4. | i and iv |
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A major disadvantage of external fertilization is:
| 1. | Lack of variations amongst the offspring |
| 2. | Need for the production of a significant number of male gametes |
| 3. | A high threat to the progeny for survival up to adulthood |
| 4. | The number of progeny per reproductive event will mostly be one |
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