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Q. No.Regarding outbreeding devices in angiosperms:
A:
Self-incompatibility allows only self-pollen to fertilise ovules.
B:
Dioecy prevents autogamy but not geitonogamy.
1.
Only A is correct
2.
Only B is correct
3.
Both A and B are correct
4.
Both A and B are incorrect
Subtopic: Pollination & Outbreeding Devices |
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| Assertion (A): | Cells of tapetum have more than one nucleus. |
| Reason (R): | They undergo meiosis without cytokinesis. |
Options:
| 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: Stamen: Anther |
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Which of the following statements is true about polyembryony?
| 1. | It refers to the presence of multiple cotyledons in the embryo. |
| 2. | It is the formation of multiple embryos from a single fertilized egg. |
| 3. | It occurs only in albuminous seeds, such as wheat and rice. |
| 4. | It results from the division of nucellar or integumentary cells to form additional embryos. |
Subtopic: Apomixis & Polyembryony |
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Consider the given two statements:
| Assertion (A): | In xenogamy, pollen is transferred from the anther of one plant to the stigma of another plant of a different species. |
| Reason (R): | Xenogamy results in genetic variation as it involves the fusion of gametes from different individuals. |
| 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: Pollination & Outbreeding Devices |
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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 |
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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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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:
| 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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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): | 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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