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Q. No.Given below are two statements:
Assertion (A):
At maturity, a typical angiospermic embryo sac is 7 celled 8-nucleated structure.
Reason (R):
There is a characteristic distribution of the cells within the embryo sac of the 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.
Both (A) and (R) are false.
Subtopic: Pistil: Ovule |
51%
From NCERT
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Given below are two statements:
| Assertion (A): | Cleistogamous flowers are invariably autogamous. |
| Reason (R): | Cleistogamous flowers never expose their sex organs, so there is no chance of cross pollination in these flowers. |
| 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 |
90%
From NCERT
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Given below are two statements:
| Assertion (A): | Some species of Asteraceae and grasses have evolved special mechanism to produce seeds without fertilisation called as apomixis. |
| Reason (R): | Apomixis is a form of asexual reproduction that mimics sexual reproduction. |
| 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: Apomixis & Polyembryony |
55%
From NCERT
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Given below are two statements:
| Assertion (A): | Cultivation of hybrids has tremendously increased the productivity. |
| Reason (R): | If hybrids are made into apomicts, there is segregation of characters in the hybrid progeny.- |
| 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: Apomixis & Polyembryony |
59%
From NCERT
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Given below are two statements:
| Assertion (A): | Pollen grains are not rich in nutrients. |
| Reason (R): | Pollen consumption does not increase the performance of athletes and race horses. |
| 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: Stamen: Male Gametophyte |
92%
From NCERT
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Given below are two statements:
| Assertion (A): | Pollen grains represent the male gametophytes. |
| Reason (R): | The cell wall of pollen grain is called sporoderm. |
| 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: Stamen: Male Gametophyte |
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Given below are two statements:
| Assertion (A): | Wind pollinated flowers have large feathery stigma to trap pollen grains. |
| Reason (R): | Wing pollination is common in plants like Amorphophallus and Yucca. |
| 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 |
76%
From NCERT
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Given below are two statements:
| Assertion (A): | Geitonogamy involves a pollinating agent. |
| Reason (R): | Genetically geitonogamy is similar to xenogamy |
| 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 |
80%
From NCERT
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Given below are two statements:
| Assertion (A): | Embryo development precedes endosperm development. |
| Reason (R): | Early stages of embryogeny are different in both monocots and dicots though seeds are similar. |
| 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: Embryo |
62%
From NCERT
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Given below are two statements:
| Assertion (A): | Parthenocarpic fruits are seedless. |
| Reason (R): | Fruits developing after fertilisation are called parthenocarpic fruits. |
| 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: Fruit |
85%
From NCERT
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