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Q. No.What is unique about the pollen exine?
1.
It is made of cellulose and is highly permeable.
2.
It is made of sporopollenin, which is extremely resistant to harsh environmental conditions and enzymes.
3.
It is soft and easily degradable to facilitate germination.
4.
It contains chlorophyll to aid in photosynthesis.
Subtopic: Stamen: Male Gametophyte |
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Which statement about the viability of pollen grains is correct?
| 1. | Pollen grains are viable for several weeks after release. |
| 2. | Pollen grains lose their viability within 30 minutes of release. |
| 3. | The viability of pollen grains varies among species, ranging from a few minutes to several months. |
| 4. | All pollen grains remain viable indefinitely when stored at room temperature. |
Subtopic: Stamen: Male Gametophyte |
90%
From NCERT
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Perisperm differs from endosperm in that:
| 1. | Perisperm is derived from the fertilization of the central cell, while endosperm is not. |
| 2. | Perisperm is a diploid tissue, while endosperm is tetraploid. |
| 3. | Endosperm is derived from the fertilization of the central cell, while perisperm is not. |
| 4. | Endosperm is a diploid tissue, while perisperm is triploid. |
Subtopic: Seed |
87%
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Consider the given two statements:
| Assertion (A): | Wind-pollinated plants often have long and feathery stigmas. |
| Reason (R): | The large surface area of feathery stigmas increases the chance of catching pollen grains from the air. |
| 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: Pollination & Outbreeding Devices |
97%
From NCERT
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The layers in the wall of a microsporangium, from the outermost to the innermost, are:
| 1. | Epidermis, endothecium, middle layers, tapetum |
| 2. | Tapetum, middle layers, endothecium, epidermis |
| 3. | Endothecium, epidermis, tapetum, middle layers |
| 4. | Middle layers, tapetum, endothecium, epidermis |
Subtopic: Stamen: Microsporangium |
97%
From NCERT
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Match the following structures with their functions during the reproduction in flowering plants:
Codes:
| Column I | Column II | ||
| A | Pollen Tube | P | Feeds the developing embryo |
| B | Stigma | Q | Site of pollen grain landing |
| C | Endosperm | R | Allows the sperm to reach the ovule |
| D | Micropyle | S | Entry point for pollen tube into ovule |
| A | B | C | D | |
| 1. | S | Q | R | P |
| 2. | R | Q | P | S |
| 3. | P | R | Q | S |
| 4. | Q | P | S | R |
Subtopic: Stamen: Male Gametophyte | Pistil: Ovule |
95%
From NCERT
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What is the function of the generative cell in the pollen grain at the time of pollen tube growth?
1. It divides to form two sperm cells.
2. It forms the pollen tube.
3. It provides nutrition to the developing embryo.
4. It protects the pollen grain from desiccation.
1. It divides to form two sperm cells.
2. It forms the pollen tube.
3. It provides nutrition to the developing embryo.
4. It protects the pollen grain from desiccation.
Subtopic: Stamen: Male Gametophyte |
82%
From NCERT
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The only type of pollination which during pollination brings genetically different types of pollen grains to the stigma is:
1. Cleistogamy
2. Chasmogamy
3. Geitonogamy
4. Xenogamy
1. Cleistogamy
2. Chasmogamy
3. Geitonogamy
4. Xenogamy
Subtopic: Pollination & Outbreeding Devices |
96%
From NCERT
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Identify the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | There is no residual endosperm in mature seeds of pea and groundnut. |
| II: | Mature seeds of wheat and maize are albuminous. |
| III: | Perisperm is seen in mature seeds of black pepper and beet. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Seed |
87%
From NCERT
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Which statement is true about monosporic embryo sac development in flowering plants?
| 1. | It originates from one megaspore and involves three mitotic divisions. |
| 2. | It involves the development of eight megaspores from one mother cell. |
| 3. | It results in the formation of a seven-nucleate, eight-celled structure. |
| 4. | It begins with multiple sporogenous cells. |
Subtopic: Pistil: Female Gametophyte |
58%
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