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Q. No.Consider the given two statements:
Assertion (A):
Pollen grain exine has prominent apertures called germ pores where sporopollenin is absent.
Reason (R):
Germ pore is the structure through which the germ tube or pollen tube makes its exit on germination.
1.
Both (A) and (R) are True and (R) explains (A)
2.
Both (A) and (R) are True and (R) does not explain (A)
3.
(A) is True but (R) is False
4.
(A) is False but (R) is True
Subtopic: Stamen: Male Gametophyte |
From NCERT
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Three options given below describe the same structure in an angiosperm. Identify the one that does not belong to the group?
1. Megagametophyte
2. Megasporangium
3. Female gametophyte
4. Embryo sac
1. Megagametophyte
2. Megasporangium
3. Female gametophyte
4. Embryo sac
Subtopic: FLOWER – A FASCINATING ORGAN OF ANGIOSPERMS |
From NCERT
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Consider the given two statements:
| Statement I: | The pollen can recognize the pistil, whether it is of the right type (compatible) or of the wrong type (incompatible). |
| Statement II: | Pollen of the same species will not be compatible and will not be allowed to germinate on the stigma. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Pollination & Outbreeding Devices |
From NCERT
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Consider the given two statements:
| Assertion (A): | The innermost layer of the wall of microsporangium is critical for the pollen grains in angiosperms. |
| Reason (R): | Cells of this layer possess dense cytoplasm and generally have more than one nucleus. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Stamen: Microsporangium |
54%
From NCERT
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Consider the given two statements:
| Assertion (A): | Active research is going on in many laboratories around the world to understand the genetics of apomixis and to transfer apomictic genes into hybrid varieties. |
| Reason (R): | Hybrid crop varieties do not reproduce sexually. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Apomixis & Polyembryony |
56%
From NCERT
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Consider the given two statements:
| Assertion(A): | Majority of flowering plants produce unisexual flowers. |
| Reason (R): | In unisexual flowers, pollen grains are likely to come in contact with the stigma of the same flower. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Pollination & Outbreeding Devices |
56%
From NCERT
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Consider the given two statements:
| Assertion (A): | In angiosperms, seed formation is a dependable process of sexual reproduction. |
| Reason (R): | In angiosperms, reproductive processes such as pollination and fertilisation are independent of water. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Monocarpic & Polycarpic | Seed | FLOWER – A FASCINATING ORGAN OF ANGIOSPERMS |
From NCERT
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Consider the given two statements:
| Statement I: | In over 60 per cent of angiosperms, pollen grains are shed at 2-celled stage. |
| Statement II: | In the remaining species, the vegetative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Monocarpic & Polycarpic | Stamen: Anther | Stamen: Microsporangium |
55%
From NCERT
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Consider the two statements:
| Assertion (A): | Flowering plants have evolved adaptations to promote cross pollination. |
| Reason (R): | Most angiosperms are dioeceous plants. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Pollination & Outbreeding Devices |
From NCERT
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Consider the given two statements:
| Assertion (A): | Endosperm is formed before fertilization in angiosperms. |
| Reason (R): | It provides nourishment to the developing embryo. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Endosperm |
58%
From NCERT
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