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Q. No.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 |
Level 3: 35%-60%
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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%
Level 1: 80%+
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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%
Level 1: 80%+
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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%
Level 1: 80%+
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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%
Level 1: 80%+
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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%
Level 1: 80%+
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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%
Level 3: 35%-60%
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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%
Level 2: 60%+
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Occasionally, in some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the:
| 1. | endosperm | 2. | perisperm |
| 3. | pericarp | 4. | periderm |
Subtopic: Pistil: Female Gametophyte |
93%
Level 1: 80%+
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Identify the correct statements from the ones given below:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | In a few species, such as apple, strawberry, cashew, etc., the thalamus also contributes to fruit formation. |
| II: | Most fruits develop only from the ovary and are called true fruits. |
| III: | Fruits can never develop without fertilisation. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Seed | Fruit |
94%
Level 1: 80%+
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