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Q. No.In corn seed, the radicle is enclosed in a
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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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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