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Q. No.Three options given below describe the same structure in an angiosperm. Identify the one that does not belong to the group?
1. Megagametophyte
2. Megasporangium
3. Female gametophyte
4. Embryo sac
1. Megagametophyte
2. Megasporangium
3. Female gametophyte
4. Embryo sac
Subtopic: FLOWER – A FASCINATING ORGAN OF ANGIOSPERMS |
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At the four nucleate stage, the number of cells present in a female gametophyte of a typical angiosperm is:
| 1. | 1 | 2. | 2 |
| 3. | 4 | 4. | 7 |
Subtopic: Pistil: Female Gametophyte |
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In Michelia, the gynoecium:
1. has multiple distinct carpels
2. has multiple carpels fused in a single bundle
3. has a single carpel
4. has multiple carpels fused in multiple bundles
1. has multiple distinct carpels
2. has multiple carpels fused in a single bundle
3. has a single carpel
4. has multiple carpels fused in multiple bundles
Subtopic: Pistil: Female Gametophyte |
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Which of the following is the correct description of an anther?
| 1. | Pollen sac |
| 2. | The pollen-producing reproductive organ of a flower |
| 3. | The male gametophyte of angiosperms |
| 4. | The part of a stamen that contains the pollen |
Subtopic: Stamen: Anther |
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Consider the two statements:
| Assertion (A): | Flowering plants have evolved adaptations to promote cross pollination. |
| Reason (R): | Most angiosperms are dioeceous plants. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Pollination & Outbreeding Devices |
Level 3: 35%-60%
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Consider the given two statements:
| Statement I: | The pollen can recognize the pistil, whether it is of the right type (compatible) or of the wrong type (incompatible). |
| Statement II: | Pollen of the same species will not be compatible and will not be allowed to germinate on the stigma. |
| 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: Pollination & Outbreeding Devices |
Level 3: 35%-60%
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Consider the given two statements:
| Assertion (A): | Pollen grain exine has prominent apertures called germ pores where sporopollenin is absent. |
| Reason (R): | Germ pore is the structure through which the germ tube or pollen tube makes its exit on germination. |
| 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: Stamen: Male Gametophyte |
Level 3: 35%-60%
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Consider the given two statements:
| Assertion(A): | Majority of flowering plants produce unisexual flowers. |
| Reason (R): | In unisexual flowers, pollen grains are likely to come in contact with the stigma of the same flower. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Pollination & Outbreeding Devices |
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Consider the given two statements:
| Assertion (A): | The innermost layer of the wall of microsporangium is critical for the pollen grains in angiosperms. |
| Reason (R): | Cells of this layer possess dense cytoplasm and generally have more than one nucleus. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Stamen: Microsporangium |
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Regarding outbreeding devices in angiosperms:
| A: | Self-incompatibility allows only self-pollen to fertilise ovules. |
| B: | Dioecy prevents autogamy but not geitonogamy. |
| 1. | Only A is correct |
| 2. | Only B is correct |
| 3. | Both A and B are correct |
| 4. | Both A and B are incorrect |
Subtopic: Pollination & Outbreeding Devices |
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