The sobriquet ‘terror of Bengal’ has been given to:
1. | Pistia | 2. | Lemna |
3. | Eichhornia | 4. | Zostera |
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Consider the two statements:
I: | Organisms like algae and fungi shift to a sexual mode of reproduction just before the onset of adverse conditions. |
II: | In sexual reproduction large number of progeny can be produced in a short span of time. |
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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Which of the following is not always true for sexual mode of reproduction?
I. Separate sexes in the species
II. Gamete formation
III. Fertilization
1. | Only I | 2. | Only III |
3. | Both I and III | 4. | Both II and III |
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Identify the correct statements:
I. | Clear-cut vegetative, juvenile, and senescent phases are seen only in perennial plants. |
II. | Neelakurinji flowers once in 12 years. |
III. | Bamboo flowers only once in their lifetime. |
1. | Only III |
2. | Only II and III |
3. | Only I and II |
4. | I, II, and III |
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Birds in captivity (as in poultry farms) :
1. | lay eggs seasonally |
2. | can be made to lay eggs throughout the year |
3. | exhibit estrous cycles |
4. | exhibit menstrual cycles |
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Menstrual cycles occur in:
1. all animal females
2. all female mammals
3. female monkeys, apes, and humans
4. only in human females
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Which of the following is the most critical event of sexual reproduction?
1. | Gametogenesis | 2. | Gamete Transfer |
3. | Fertilization | 4. | Embryogenesis |
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A plant with both male flowers and female flowers is called as:
1. | Unisexual | 2. | Bisexual |
3. | Dioecious | 4. | Monoecious |
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A flower that produces only pollens is called as:
1. | Perfect flower | 2. | Staminode |
3. | Dioecious | 4. | Staminate |
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