Regarding a typical monosporic embryosac in the angiosperms:
I: Three cells are grouped together at the micropylar end and constitute the egg apparatus.
II: The egg apparatus, in turn, consists of two antipodals and one egg cell.
III: The antipodals have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.
IV: Three cells are at the chalazal end and are called the Synergids.
1. Only I is correct
2. Only I and IV are correct
3. Only II and III are correct
4. Only III is correct
Subtopic: Â Monocarpic & Polycarpic |Â Pistil: Ovule |Â Pistil: Female Gametophyte |
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From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| COLUMN I | COLUMN II | ||
| A | Ex-albuminous seeds | P | Wheat, Castor |
| B | Albuminous seeds | Q | Black pepper, Beet |
| C | Perisperm | R | Pea, Groundnut |
Codes:
| A | B | C | |
| 1. | P | Q | R |
| 2. | Q | P | R |
| 3. | R | P | Q |
| 4. | R | Q | P |
Subtopic: Â Seed |
 87%
From NCERT
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Assertion(A): Geitonogamy is similar to autogamy.
Reason(R): Pollen grains come from the same flower of a different plant.
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): Pollen grains come from the same flower of a different plant.
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: Â Pollination & Outbreeding Devices |
 76%
From NCERT
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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.
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: Â Double Fertilization |
From NCERT
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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: Â Seed |
 73%
From NCERT
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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
1. 10
2. 20
3. 30
4. 40
Subtopic: Â Double Fertilization |Â Endosperm |
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From NCERT
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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: Â Stamen: Microsporangium |
 82%
From NCERT
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At maturity, the female gametophyte in angiosperms has:
| 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 |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Â Pistil: Ovule |Â Pistil: Female Gametophyte |
 88%
From NCERT
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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: Â Pollination & Outbreeding Devices |
 81%
From NCERT
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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
1. epidermis
2. endothecium
3. middle layers
4. tapetum
Subtopic: Â Stamen: Anther |Â Stamen: Microsporangium |
 90%
From NCERT
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