Q. No.A typical microsporangium is generally surrounded by four wall layers where the outer three wall layers perform
the function:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
the function:
| I: | of protection of the developing pollen grain |
| II: | in dehiscence of anther to release the pollen |
| III: | to nourish the developing pollen grains |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Stamen: Anther | Stamen: Microsporangium | Stamen: Male Gametophyte |
90%
From NCERT
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During microsporogenesis, meiosis occurs in:
| 1. | Endothecium | 2. | Microspore mother cells |
| 3. | Microspore tetrads | 4. | Pollen grains |
Subtopic: Stamen: Male Gametophyte |
91%
From NCERT
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Which of the following statements about pollen grains is true?
| 1. | Pollen grains are male gametophytes enclosed within the pollen sac. |
| 2. | Pollen grains are diploid and generate female gametes. |
| 3. | Pollen grains are produced in the ovule. |
| 4. | Pollen grains undergo mitosis to produce pollen tubes. |
Subtopic: Stamen: Male Gametophyte |
93%
From NCERT
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‘Germ pore’ in pollen in angiosperms:
| 1. | is a part of pollen intine where sporopollenin is present |
| 2. | is a part of pollen intine where sporopollenin is absent |
| 3. | is a part of pollen exine where sporopollenin is present |
| 4. | is a part of pollen exine where sporopollenin is absent |
Subtopic: Stamen: Male Gametophyte |
78%
From NCERT
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Pollen grain intine:
I: is the inner wall
II: is composed of sporopollenin
III: has prominent apertures
I: is the inner wall
II: is composed of sporopollenin
III: has prominent apertures
| 1. | Only I is correct | 2. | Only I and III are correct |
| 3. | Only II is correct | 4. | I, II, III are incorrect |
Subtopic: Stamen: Anther | Stamen: Microsporangium | Stamen: Male Gametophyte |
75%
From NCERT
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Consider the given two statements:
| Assertion (A): | Pollen exine is extremely hard and can withstand harsh environmental conditions. |
| Reason (R): | Pollen exine is made of sporopollenin, which is resistant to high temperatures and strong acids and alkalis. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Stamen: Male Gametophyte |
98%
From NCERT
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Which of the following is incorrect regarding vegetative cell of pollen grains?
| 1. | It is the bigger cell in the pollen grain |
| 2. | It has abundant food reserves |
| 3. | It has a large irregularly shaped nucleus |
| 4. | It floats in the cytoplasm of generative cell |
Subtopic: Stamen: Male Gametophyte |
80%
From NCERT
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Consider the given two statements:
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
| Statement I: | The vegetative cell in a pollen grain is bigger, has an abundant food reserve, and has a large, irregularly shaped nucleus. |
| Statement II: | The generative cell in a pollen grain is small and floats in the cytoplasm of the vegetative cell. |
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: Stamen: Anther | Stamen: Microsporangium | Stamen: Male Gametophyte |
95%
From NCERT
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In over 60 % of angiosperms, pollen grains are shed at:
| 1. | 2-celled stage | 2. | 3-celled stage |
| 3. | 4-celled stage | 4. | 1-celled stage |
Subtopic: Stamen: Male Gametophyte |
88%
From NCERT
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Identify the incorrect statement regarding Parthenium hysterophorus:
| 1. | Its pollens are a very common cause of severe respiratory allergies. |
| 2. | It was introduced in India accidentally as a contaminant in wheat. |
| 3. | It is a native of tropical America |
| 4. | It is non-invasive and limited to certain pockets in India only |
Subtopic: Stamen: Male Gametophyte |
74%
From NCERT
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