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Q. No.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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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%
From NCERT
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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%
From NCERT
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All the following are advantages seeds offer to angiosperms:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Seed formation is more dependable. |
| II: | Seeds have better adaptive strategies for dispersal to new habitats. |
| III: | Seeds preserve genetic homogeneity and do not allow new variations in the gene pool. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Seed |
74%
From NCERT
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A recent record of 2000 years old viable seed has been discovered during the archaeological excavation at King Herod’s palace near the Dead Sea. This seed is of:
| 1. | Lupinus arcticus | 2. | Phoenix dactylifera |
| 3. | Strobilanthes kunthiana | 4. | Arabidopsis thaliana |
Subtopic: Seed |
85%
From NCERT
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Consider the given two statements:
| Assertion (A): | Hybrid varieties of several of our food and vegetable crops are being extensively cultivated. |
| Reason (R): | Hybrid seeds have to be produced every year. |
| 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: Apomixis & Polyembryony |
63%
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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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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