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Q. No.Consider the given two statements:
Assertion (A):
The flowers produce enormous amount of pollen when compared to the number of ovules available for pollination.
Reason (R):
Pollens are products of meiosis resulting in larger number of cells but egg is the product of mitosis resulting in fewer number of cells.
1.
Both (A) and (R) are True and (R) explains (A)
2.
Both (A) and (R) are True and (R) does not explain (A)
3.
(A) is True but (R) is False
4.
(A) is False but (R) is True
Subtopic: Pollination & Outbreeding Devices | Post Pollination Events |
72%
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 |
56%
From NCERT
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Match each item in Column-I with one in Column-II and select the correct match from the codes given:
Codes:
| Column-I | Column-II | ||
| A. | Vallisneria | P. | Pollinated by insects |
| B. | Zostera | Q. | Water pollinated plant found in fresh water |
| C. | Water lily | R. | Water pollinated plant found in marine water |
| A | B | C | |
| 1. | P | Q | R |
| 2. | P | R | Q |
| 3. | Q | R | P |
| 4. | Q | P | R |
Subtopic: Pollination & Outbreeding Devices |
88%
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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Subtopic: Pollination & Outbreeding Devices |
97%
From NCERT
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Match each term in Column-I with its correct description in Column-II and select the correct match from the codes given:
Codes:
| Column-I | Column-II | ||
| A. | Monoecious | P. | plants with unisexual flowers which occur on the same individual |
| B. | Dioeceous | Q. | plants having either only male or only female flowers |
| C. | Unisexual | R. | flower having both male and female structures |
| D. | Bisexual | S. | flower having either male or female structures |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | P | Q | S | R |
| 3. | Q | P | R | S |
| 4. | Q | P | S | R |
Subtopic: Pollination & Outbreeding Devices |
69%
From NCERT
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Consider the given two statements:
| Assertion (A): | Cleistogamous flowers produce assured seed-set even in the absence of pollinators. |
| Reason (R): | Cleistogamous flowers are invariably autogamous. |
| 1. | Both (A) and (R) are True and (R) explains (A) |
| 2. | Both (A) and (R) are True and (R) does not explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Pollination & Outbreeding Devices |
From NCERT
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During double fertilisation in angiosperms:
| I: | One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. |
| II: | The other male gamete moves towards the two polar nuclei located in the central cell thus completing the triple fusion. |
1. Only I is True
2. Only II is True
3. Both I and II are True
4. Both I and II are False
Subtopic: Double Fertilization |
96%
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 |
95%
From NCERT
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In the given diagram of corn plant, tassels are represented by the alphabet:
| 1. | A | 2. | B |
| 3. | C | 4. | D |
Subtopic: Pollination & Outbreeding Devices |
From NCERT
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