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Q. No.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 |
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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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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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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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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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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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