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Q. No.What floral reward does Amorphophallus provide to its pollinator?
1. Nectar
2. Safe places to lay eggs
3. Protection from predation due to its tall height
4. Camouflage
Subtopic: Pollination & Outbreeding Devices |
83%
From NCERT
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If both male and female flowers are present on the same plant such as castor and maize:
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: | the plants are called as monoecious |
| II: | it prevents autogamy but not geitonogamy |
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 |
81%
From NCERT
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In plants which shed pollen in the three-celled condition, pollen tubes carry:
| 1. | a single male gametes from the beginning |
| 2. | two male gametes from the beginning |
| 3. | two male gametes after the division in generative cell |
| 4. | two male gametes after the division in vegetative cell |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
From NCERT
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Pollen tube enters the ovule:
| 1. | through the micropyle and then enters one of the synergids through the filiform apparatus. |
| 2. | through the chalaza and then enters one of the synergids through the filiform apparatus. |
| 3. | through the micropyle and then enters one of the antipodals through the egg apparatus. |
| 4. | through the chalaza and then enters one of the antipodals through the egg apparatus. |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
94%
From NCERT
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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
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The central cell of the embryo sac:
| 1. | after syngamy becomes the primary endosperm cells |
| 2. | after syngamy becomes the zygote |
| 3. | after triple fusion becomes the primary endosperm cell |
| 4. | after triple fusion becomes the zygote |
Subtopic: Double Fertilization |
91%
From NCERT
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Endosperm is completely consumed by the developing embryo in all of the following angiosperms, except:
| 1. | pea | 2. | groundnut |
| 3. | beans | 4. | coconut |
Subtopic: Seed |
91%
From NCERT
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Consider the given two statements:
| Assertion (A): | Most zygotes divide only after certain amount of endosperm is formed. |
| Reason (R): | Embryo develops at the micropylar end of the embryo sac where the zygote is situated. |
| 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: Pollen - Pistil Interaction |
82%
From NCERT
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A typical dicotyledonous embryo, consists of an embryonal axis and two cotyledons and where:
1. Statement I is correct; Statement II is incorrect
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
| Statement I: | The portion of embryonal axis above the level of cotyledons is the coleoptiles. |
| Statement II: | The cylindrical portion below the level of cotyledons is the coleorhiza. |
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
Subtopic: Endosperm | Embryo |
52%
From NCERT
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Seeds retain a part of endosperm as it is not completely used up during embryo development in:
I: wheat
II: maize
III: barley
IV: castor
1. Only I, II and III
2. Only I, II and IV
3. Only II, III and IV
4. I, II, III and IV
I: wheat
II: maize
III: barley
IV: castor
1. Only I, II and III
2. Only I, II and IV
3. Only II, III and IV
4. I, II, III and IV
Subtopic: Seed |
77%
From NCERT
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