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Q. No.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 |
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From NCERT
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Polyembryony in mango is due to:
| 1. | The formation of multiple zygotes |
| 2. | The development of additional embryos from the integument |
| 3. | The development of embryos from somatic cells of the ovule |
| 4. | Fertilization of multiple ovules within the same ovary |
Subtopic: Apomixis & Polyembryony |
From NCERT
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Consider the given two statements:
| Assertion (A): | Parthenocarpy is desirable in fruit crops such as banana and orange. |
| Reason (R): | Parthenocarpy leads to development of seeds without fertilization. |
| 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: Apomixis & Polyembryony |
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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 |
55%
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 |
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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 |
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From NCERT
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Microsporogenesis involves:
| 1. | Mitosis followed by meiosis | 2. | Meiosis followed by mitosis |
| 3. | Only meiosis | 4. | Only mitosis |
Subtopic: Pistil: Female Gametophyte |
From NCERT
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Consider the given two statements:
| Statement I: | In some species, remnants of the nucellus persist in the seed as perisperm. |
| Statement II: | Perisperm is a type of endosperm that provides nutrition to the developing embryo. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct. |
Subtopic: Seed |
From NCERT
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Consider the given two statements:
| Assertion (A): | Polyembryony is the occurrence of more than one embryo in a seed. |
| Reason (R): | In certain species like Citrus and Mango, the female gametophytes has multiple egg cells. |
| 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 but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Apomixis & Polyembryony |
54%
From NCERT
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