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Q. No.The ovule is a small structure attached to the placenta by means of a stalk called:
1.
pedicle
2.
funicle
3.
rachis
4.
replum
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
96%
From NCERT
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Consider the given two statements:
| Statement I: | In over 60 per cent of angiosperms, pollen grains are shed at 2-celled stage. |
| Statement II: | In the remaining species, the vegetative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). |
| 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: Monocarpic & Polycarpic | Stamen: Anther | Stamen: Microsporangium |
55%
From NCERT
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Consider the given two statements:
| Statement I: | Cryopreservation or cryoconservation is a process where biological material - cells, tissues, or organs - are frozen to preserve the material for an extended period of time. |
| Statement II: | It is not possible to store pollen grains of angiosperms by cryopreservation. |
| 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: Monocarpic & Polycarpic | Stamen: Anther | Stamen: Microsporangium | Stamen: Male Gametophyte |
84%
From NCERT
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The central cell of the female gametophytes in angiosperms:
| 1. | results in the formation of a diploid cell after double fertilisation. |
| 2. | has three haploid nuclei |
| 3. | after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm. |
| 4. | after syngamy develops into an embryo |
Subtopic: Double Fertilization |
94%
From NCERT
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In black pepper and beet:
1. seed are formed without fertilisation
2. remnants of nucellus are persistent
3. seeds are ex-albuminous
4. parthenocarpy is common in natural conditions
1. seed are formed without fertilisation
2. remnants of nucellus are persistent
3. seeds are ex-albuminous
4. parthenocarpy is common in natural conditions
Subtopic: Embryo | Seed | Fruit |
92%
From NCERT
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The given figure shows:
1. Multicarpellary, syncarpous pistil
2. Multicarpellary, apocarpous gynoecium
3. Monocarpellary gynoecium
4. Sterile pistil
1. Multicarpellary, syncarpous pistil2. Multicarpellary, apocarpous gynoecium
3. Monocarpellary gynoecium
4. Sterile pistil
Subtopic: Monocarpic & Polycarpic | Pistil: Ovule | Pistil: Female Gametophyte |
77%
From NCERT
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| Assertion (A): | In angiosperms, the male gametophyte contains a single male gamete that unites with the egg to produce the seed. |
| Reason (R): | The embryosac in angiosperms has an egg apparatus that consists of only one egg cell. |
| 1. | Both (A) and (R) are True but the (R) does not correctly explain the (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and the (R) correctly explains the (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Stamen: Male Gametophyte |
71%
From NCERT
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Consider the given two statements:
| Statement I: | The majority of flowering plants produce hermaphrodite flowers. |
| Statement II: | The majority of flowering plants have a well-developed gametophyte and poorly developed sporophyte. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Post Pollination Events |
74%
From NCERT
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Consider the given two statements:
| Statement I: | Monoecy prevents autogamy but not geitonogamy. |
| Statement II: | Dioecy prevents both autogamy and geitonogamy. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Post Pollination Events |
74%
From NCERT
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Which of the following will be diploid in constitution?
a. cells of the nucellus
b. megaspore mother cell
c. the functional megaspore
d. the degenerated megaspores
a. cells of the nucellus
b. megaspore mother cell
c. the functional megaspore
d. the degenerated megaspores
| 1. | Only a and b | 2. | Only a, b and d |
| 3. | Only c and d | 4. | Only b, c and d |
Subtopic: Stamen: Male Gametophyte | Pistil: Female Gametophyte |
85%
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