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Assertion(A): Angiosperms have a unique phenomenon called double fertilization.
Reason(R): Double fertilization includes triple fusion and syngamy in the embryo sac.
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. (A) is false, but (R) is true.
Subtopic: Double Fertilization |
Level 3: 35%-60%
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Assertion(A): Seed formation is more dependable (assured) in angiosperms.
Reason(R): Reproductive processes such as pollination and fertilization are dependent on water in angiosperms.
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. (A) is false, but (R) is true.
Reason(R): Reproductive processes such as pollination and fertilization are dependent on water in angiosperms.
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. (A) is false, but (R) is true.
Subtopic: Seed |
75%
Level 2: 60%+
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Zea mays have 20 chromosomes in its somatic cell. The number of chromosomes in its endosperm will be:
| 1. | 10 | 2. | 20 |
| 3. | 30 | 4. | 40 |
Subtopic: Double Fertilization | Endosperm |
78%
Level 2: 60%+
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The two innermost wall layers of microsporangium in an anther are:
| 1. | Endothecium and tapetum |
| 2. | Epidermis and endodermis |
| 3. | Epidermis and middle layer |
| 4. | Middle layer and tapetum |
Subtopic: Stamen: Microsporangium |
84%
Level 1: 80%+
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At maturity, the female gametophyte in angiosperms has:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Three cells grouped together at the micropylar end constituting the egg apparatus |
| II: | Three cells are at the chalazal end and are called the antipodals |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Pistil: Female Gametophyte |
89%
Level 1: 80%+
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Consider the two statements:
| Statement I: | Cleistogamous flowers are invariably autogamous. |
| Statement II: | Chasmogamous flowers can never be autogamous. |
| 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 correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Pollination & Outbreeding Devices |
81%
Level 1: 80%+
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Cells of which of the following wall layer of microsporangium possess dense cytoplasm and generally have more than one nucleus?
| 1. | epidermis | 2. | endothecium |
| 3. | middle layers | 4. | tapetum |
Subtopic: Stamen: Anther | Stamen: Microsporangium |
92%
Level 1: 80%+
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During the formation of the embryo sac in angiosperms, cell walls are laid:
| 1. | from the first nuclear division |
| 2. | between the 2-nucleate and 4-nucleate stage |
| 3. | before the 8-nucleate stage |
| 4. | after the 8-nucleate stage |
Subtopic: Pistil: Female Gametophyte |
74%
Level 2: 60%+
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The pollen intine is:
| 1. | a thin and continuous layer made up of cellulose and pectin. |
| 2. | a thick and discontinuous layer made up of cellulose and pectin. |
| 3. | made up of sporopollenin and is a continuous layer. |
| 4. | made up of sporopollenin and has prominent apertures called germ pores. |
Subtopic: Stamen: Anther | Stamen: Male Gametophyte |
92%
Level 1: 80%+
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How many of the given statements are correct:
1. 2
2. 3
3. 4
4. 5
| I: | Endosperm development precedes embryo development. |
| II: | The coconut water from tender coconut is cellular endosperm. |
| III: | The white kernel in coconut is free nuclear endosperm. |
| IV: | Endosperm is completely consumed by the developing embryo in pea. |
| V: | Endosperm persists in the mature seed of castor. |
2. 3
3. 4
4. 5
Subtopic: Endosperm |
68%
Level 2: 60%+
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