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%
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Xenogamy:
| I: | is the transfer of pollen grains from anther to the stigma of a different plant. |
| II: | is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma. |
| III: | is cross pollination. |
| 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 |
89%
From NCERT
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Consider the given two statements:
| Statement I: | Pollination plays a critical role in the sexual reproduction in flowering plants. |
| Statement II: | As both types of gametes are non-motile, they have to be brought together for fertilisation to occur. |
| 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 |
87%
From NCERT
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Transfer of pollens from the anther to the stigma of the same flower is called:
| 1. | Autogamy | 2. | Geitonogamy |
| 3. | Xenogamy | 4. | Cleistogamy |
Subtopic: Pollination & Outbreeding Devices |
91%
From NCERT
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Choose the correct statement from the following:
| 1. | Cleistogamous flowers always exhibit autogamy |
| 2. | Chasmogamous flowers always exhibit geitonogamy |
| 3. | Cleistogamous flowers exhibit both autogamy and geitonogamy |
| 4. | Chasmogamous flowers never exhibit autogamy |
Subtopic: Pollination & Outbreeding Devices |
86%
From NCERT
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Chasmocleistogamy [Amphicarpy] is not seen in:
| 1. | Viola [Common pansy] | 2. | Oxalis |
| 3. | Pisum sativum | 4. | Commelina |
Subtopic: Pollination & Outbreeding Devices |
91%
From NCERT
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Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers:
| Statement I: | Cleistogamous flowers which are similar to flowers of other species with exposed anthers and stigma |
| Statement II: | Chasmogamous flowers which do not open at all. |
| 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 |
81%
From NCERT
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Consider the given two statements:
| Assertion (A): | Cleistogamous flowers produce an assured seed set. |
| Reason (R): | Cleistogamous flowers have a well-exposed anther and stigma. |
| 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: Pollination & Outbreeding Devices |
89%
From NCERT
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In autogamy:
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: | pollination is achieved within the same flower. |
| II: | there is the advantage of producing high genetic diversity in the species. |
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 |
91%
From NCERT
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Geitonogamy is:
| 1. | Functionally cross–pollination but genetically autogamy |
| 2. | Functionally autogamy but genetically cross-pollination |
| 3. | Functionally and genetically autogamy |
| 4. | Functionally and genetically cross-pollination |
Subtopic: Pollination & Outbreeding Devices |
90%
From NCERT
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