Q. No.Plant species pollinated by water fall into two categories:
| (i) | Those that distribute their pollen to the surface of water |
| (ii) | Those that distribute their pollen beneath the surface of water |
The correct examples of the two categories will be:
| (i) | (ii) | |
| 1. |
Vallisneria |
Sea grasses |
|
2. |
Water hyacinth |
Sea grasses |
|
3. |
Sea grasses |
Water lily |
|
4. |
Sea grasses |
Vallisneria |
Subtopic: Pollination & Outbreeding Devices |
58%
From NCERT
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Consider the given two statements:
| Statement I: | In a normal flower which opens and exposes the anthers and the stigma, complete autogamy is rather rare. |
| Statement II: | Self-pollination can lead to inbreeding depression due to expression of deleterious recessive mutations. |
| 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: Pollination & Outbreeding Devices |
77%
From NCERT
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Pollination by water:
I: is quite common in flowering plants
II: is limited to about 30 genera, mostly dicotyledons
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: is quite common in flowering plants
II: is limited to about 30 genera, mostly dicotyledons
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 |
67%
From NCERT
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Consider the given two statements:
| Assertion (A): | Cleistogamous flowers are invariably autogamous. |
| Reason (R): | There is no chance of cross-pollen landing on the stigma in cleistogamous flowers. |
| 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: Pollination & Outbreeding Devices |
89%
From NCERT
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Geitonogamy
1. Only I is correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II and III are incorrect
| I: | is the transfer of pollen grains from the anther to the stigma of another flower of the same plant. |
| II: | is genetically cross-pollination involving a pollinating agent |
| III: | functionally is similar to autogamy |
1. Only I is correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II and III are incorrect
Subtopic: Pollination & Outbreeding Devices |
76%
From NCERT
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Consider the given two statements:
Assertion: Often flowers of animal-pollinated plants are specifically adapted for a particular species of animal.
Reason: Plants were already widespread on land when animals invaded land.
Assertion: Often flowers of animal-pollinated plants are specifically adapted for a particular species of animal.
Reason: Plants were already widespread on land when animals invaded land.
| 1. | Both Assertion and Reason are true and Reason explains Assertion |
| 2. | Both Assertion and Reason are true and Reason does not explain Assertion |
| 3. | Assertion is true but Reason is false |
| 4. | Assertion is false but Reason is true |
Subtopic: Pollination & Outbreeding Devices |
62%
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): | Chasmogamous flowers are invariably autogamous |
| Reason (R): | All chasmogamous flowers are unisexual. |
| 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 |
73%
From NCERT
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Consider the given two statements:
| Assertion(A): | Wind and water pollinated flowers produce enormous amount of pollen when compared to the number of ovules available for pollination. |
| Reason (R): | Both wind and water pollinated flowers are not very colourful and do not produce nectar. |
| 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 |
82%
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: | Cleistogamous flowers never exhibit autogamy |
| II: | Chasmogamous flowers always exhibit geitonogamy |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Pollination & Outbreeding Devices |
78%
From NCERT
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