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Q. No.In angiosperms:
I:
Each anther develops four microsporangia
II:
Each microspore mother cell undergoes meiosis and produces four haploid microspores
III:
Each microspore gives rise to a male gametophyte
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Stamen: Microsporangium |
73%
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Consider the given two statements:
I. Flowers of wind pollinated species are often small, green, and inconspicuous and they produce neither scent nor the nectar.
II. Their reproductive success does not depend on attracting pollinators.
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 but II is incorrect
4. II is correct but I is incorrect
I. Flowers of wind pollinated species are often small, green, and inconspicuous and they produce neither scent nor the nectar.
II. Their reproductive success does not depend on attracting pollinators.
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 but II is incorrect
4. II is correct but I is incorrect
Subtopic: Pollination & Outbreeding Devices |
66%
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Consider the given two statements:
I. Endosperm has an important role within the human diet worldwide.
II. In cereal crops, the nutritious part of the grain is the seed and its endosperm.
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 but II is incorrect
4. II is correct but I is incorrect
I. Endosperm has an important role within the human diet worldwide.
II. In cereal crops, the nutritious part of the grain is the seed and its endosperm.
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 but II is incorrect
4. II is correct but I is incorrect
Subtopic: Endosperm |
73%
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The number of male gametes required to produce 200 seeds in a typical angiosperm would be:
| 1. | 50 | 2. | 100 |
| 3. | 200 | 4. | 400 |
Subtopic: Double Fertilization |
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Nucellar polyembryony:
I. is a type of apomixis
II. produces embryos that are genetically identical to the parent plant
1. Both I and II are correct
2. Only I is correct
3. Only II is correct
4. Both I and II are incorrect
I. is a type of apomixis
II. produces embryos that are genetically identical to the parent plant
1. Both I and II are correct
2. Only I is correct
3. Only II is correct
4. Both I and II are incorrect
Subtopic: Apomixis & Polyembryony |
79%
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Identify the correct statements:
| I: | In castor and maize, autogamy is prevented but not geitonogamy |
| II. | In papaya, both autogamy and geitonogamy are prevented |
| 1. | Both I and II | 2. | Only I |
| 3. | Only II | 4. | Neither I nor II |
Subtopic: Pollination & Outbreeding Devices |
81%
From NCERT
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Identify the correct relationship of an ovary and an ovule in angiosperms:
| 1. | ovary is the enlarged apical portion of the pistil; the ovary contains ovules, which develop into seeds upon fertilization |
| 2. | ovary is the enlarged basal portion of the pistil; the ovary contains ovules, which develop into seeds upon fertilization |
| 3. | ovary is the enlarged basal portion of the pistil; the ovary contains ovules, which develop into fruits upon fertilization |
| 4. | ovary is the enlarged apical portion of the pistil; the ovary contains ovules, which develop into fruits upon fertilization |
Subtopic: Pistil: Ovule |
82%
From NCERT
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Regarding pollen grains:
1. Only I is correct
2. Only I and III are correct
3. Only II is correct
4. I, II and III are correct
| I. | Exine is made up of sporopollenin |
| II. | Generative cell is bigger than the vegetative cell |
| III. | Generative cell divides meiotically to produce male gametes |
2. Only I and III are correct
3. Only II is correct
4. I, II and III are correct
Subtopic: Stamen: Male Gametophyte |
57%
From NCERT
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What is the fate of the male gametes discharged in the synergid?
| 1. | One fuses with the egg and the other fuses with central cell nuclei |
| 2. | One fuses with the egg and the other(s) degenerate(s) in the synergid |
| 3. | All fuse with the egg |
| 4. | One fuses with the egg and the other(s) fuse(s) with a synergid nucleus |
Subtopic: Post Pollination Events |
94%
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Geitonogamy involves:
| 1. | Pollination of a flower by the pollen from another flower of the same plant. |
| 2. | Pollination of a flower by the pollen from another same flower. |
| 3. | Pollination of a flower by the pollen from a flower of another plant in the same population. |
| 4. | Pollination of a flower by the pollen from a flower of another plant belonging to a distant population. |
Subtopic: Pollination & Outbreeding Devices |
92%
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