- 1(current)
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:
| 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): | 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 |
52%
From NCERT
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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 |
52%
From NCERT
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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 |
53%
From NCERT
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Q. No.
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