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Q. No.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 |
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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 |
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Long filamentous threads protruding at the end of a young cob of maize are:
| 1. | anthers | 2. | styles |
| 3. | ovaries | 4. | hairs |
Subtopic: Pollination & Outbreeding Devices |
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The plant parts which consist of two generations, one within the other, are:
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
| 1. | (a), (b), and (c) | 2. | (c) and (d) |
| 3. | (a) and (d) | 4. | (a) only |
Subtopic: Seed |
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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 |
58%
From NCERT
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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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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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In angiosperms:
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
| 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 |
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%
From NCERT
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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:
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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