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Q. No.Which cells in the embryosac of angiosperms degenerate after fertilization?
1. Antipodal and primary endosperm cell
2. Synergids and primary endosperm cell
3. Synergids and antipodals
4. Egg and antipodals
Subtopic: Pistil: Female Gametophyte |
94%
From NCERT
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In corn seed, the radicle is enclosed in a
1. scutellum
2. coleorrhiza
3. aleurone
4. coleoptile
1. scutellum
2. coleorrhiza
3. aleurone
4. coleoptile
Subtopic: Embryo |
91%
From NCERT
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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 |
From NCERT
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Long, ribbon-like pollen grains are characteristically seen in some:
1. aquatic plants
2. bird-pollinated grasses
3. gymnosperms
4. wind-pollinated flowers
1. aquatic plants
2. bird-pollinated grasses
3. gymnosperms
4. wind-pollinated flowers
Subtopic: Pollination & Outbreeding Devices |
78%
From NCERT
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What will be the ploidy of the endosperm in an angiosperm produced as a result of a cross between a tetraploid female plant and a diploid male plant?
1. Triploid
2. Tetraploid
3. Pentaploid
4. Hexaploid
1. Triploid
2. Tetraploid
3. Pentaploid
4. Hexaploid
Subtopic: Post Pollination Events | Double Fertilization | Endosperm |
61%
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Which of the following statements about pollen grains is incorrect?
| 1. | Pollen grains are part of the male gametophytes in flowering plants. |
| 2. | Each pollen grain contains two cells: the vegetative cell and the generative cell. |
| 3. | The outer wall of the pollen grain is called the exine, which is known for its high resistance to decay. |
| 4. | Pollen grains are formed in the megasporangium of the flower. |
Subtopic: Stamen: Microsporangium |
93%
From NCERT
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Consider the given two statements:
| Assertion (A): | The endosperm is formed before fertilization in most flowering plants. |
| Reason (R): | The endosperm serves as a nutritional source for the developing embryo. |
| 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: Endosperm |
From NCERT
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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 |
97%
From NCERT
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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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