- 1(current)
Q. No.In about 40 per cent of angiosperms:
| 1. | pollens are shed at two-celled stage |
| 2. | the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed |
| 3. | the vegetative cell divides mitotically to give rise to the two male gametes before pollen grains are shed |
| 4. | pollens do not make gametes at all |
Subtopic: Pollination & Outbreeding Devices | Post Pollination Events |
81%
Please attempt this question first.
Hints
Please attempt this question first.
Consider the given two statements:
| Assertion (A): | The flowers, pollinated by wind or water, produce an enormous amount of pollen when compared to the number of ovules available for pollination. |
| Reason (R): | Pollen grains coming in contact with the stigma is a chance factor in both wind and water pollination. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and (R) correctly explains (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Post Pollination Events |
78%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Consider the given two statements:
| Statement I: | Pollination by water is quite rare in flowering plants, limited to about 30 genera, mostly monocotyledons. |
| Statement II: | Water is a regular mode of transport for the male gametes among the lower plant groups such as algae, bryophytes and pteridophytes. |
| 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 | Post Pollination Events |
90%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Self-incompatibility:
| I: | prevents inbreeding |
| II: | is a genetic mechanism |
| III: | prevents self-pollen from fertilising the ovules by inhibiting pollen germination or pollen tube growth in the pistil. |
| 1. | Only I and II are correct | 2. | Only I and III are correct |
| 3. | Only II and III are correct | 4. | I, II and III are correct |
Subtopic: Pollination & Outbreeding Devices | Post Pollination Events |
84%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Consider the given two statements:
| Assertion (A): | Emasculation and bagging techniques are vital for the success of artificial hybridization experiments performed by plant breeders. |
| Reason (R): | In such crossing experiments, it is important to make sure that only the desired pollen grains are used for pollination and the stigma is protected from contamination (from unwanted pollen). |
| 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 | Post Pollination Events |
87%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
During artificial hybridisation experiments:
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: | If the female parent produces unisexual flowers, there is no need for emasculation. |
| II: | The female flower buds are never bagged as well. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Post Pollination Events |
82%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.