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Q. No.How many of the given statements regarding the characteristic distribution of the cells within the embryo sac of an angiosperm are correct?
| I: | Three cells are grouped together at the micropylar end and constitute the egg apparatus. |
| II: | Three cells are at the chalazal end and are called the antipodals. |
| III: | The large central cell, as mentioned earlier, has two polar nuclei. |
| IV: | A typical angiosperm embryo sac, at maturity, though 8-nucleate is 7-celled. |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Pistil: Female Gametophyte |
89%
From NCERT
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Chasmogamous flowers:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | produce assured seed-set even in the absence of pollinators. |
| II: | are invariably autogamous. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Pollination & Outbreeding Devices |
65%
From NCERT
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Xenogamy:
| I: | is transfer of pollen grains from anther to the stigma of a different plant. |
| II: | is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Subtopic: Pollination & Outbreeding Devices |
94%
From NCERT
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Pollination by wind is more common amongst abiotic pollinations. |
| II: | Wind pollination requires that the pollen grains are light and non-sticky. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Pollination & Outbreeding Devices |
92%
From NCERT
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Pollination by water:
| 1. | is very common in flowering plants but is limited mostly to monocotyledons. |
| 2. | is quite rare in flowering plants and is limited mostly to dicotyledons. |
| 3. | is quite rare in flowering plants and is limited mostly to monocotyledons. |
| 4. | is very common in flowering plants but is limited mostly to dicotyledons. |
Subtopic: Pollination & Outbreeding Devices |
71%
From NCERT
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Consider the given two statements:
| Assertion (A): | Majority of insect-pollinated flowers are large, colourful, fragrant and rich in nectar. |
| Reason (R): | Animals are attracted to flowers by colour and/or fragrance. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and (R) correctly explains (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Pollination & Outbreeding Devices |
80%
From NCERT
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What floral reward does Amorphophallus provide to its pollinator?
1. Nectar
2. Safe places to lay eggs
3. Protection from predation due to its tall height
4. Camouflage
1. Nectar
2. Safe places to lay eggs
3. Protection from predation due to its tall height
4. Camouflage
Subtopic: Pollination & Outbreeding Devices |
83%
From NCERT
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If both male and female flowers are present on the same plant such as castor and maize:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the plants are called as monoecious |
| II: | it prevents autogamy but not geitonogamy |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Pollination & Outbreeding Devices |
81%
From NCERT
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In plants which shed pollen in the three-celled condition, pollen tubes carry:
| 1. | a single male gametes from the beginning |
| 2. | two male gametes from the beginning |
| 3. | two male gametes after the division in generative cell |
| 4. | two male gametes after the division in vegetative cell |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
From NCERT
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Pollen tube enters the ovule:
| 1. | through the micropyle and then enters one of the synergids through the filiform apparatus. |
| 2. | through the chalaza and then enters one of the synergids through the filiform apparatus. |
| 3. | through the micropyle and then enters one of the antipodals through the egg apparatus. |
| 4. | through the chalaza and then enters one of the antipodals through the egg apparatus. |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
94%
From NCERT
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