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Q. No.Given below are two statements:
Assertion (A):
Plant growth is open and indeterminate.
Reason (R):
Plants retain the capacity for unlimited growth throughout their life.
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: Growth |
81%
From NCERT
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Given below are two statements:
| Assertion (A): | The increased growth per unit of time is termed the growth rate. |
| Reason (R): | The rate of growth cannot be expressed mathematically. |
| 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: Growth |
85%
From NCERT
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Given below are two statements:
| Assertion (A): | Spraying sugarcane crops with gibberellins increases the length of the stem. |
| Reason (R): | Sugarcane yield decreases as much as 20 tonnes per acre by spraying gibberellins. |
| 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: Gibberellin |
71%
From NCERT
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Given below are two statements:
| Assertion (A): | Spraying juvenile conifers with GAs hastens the maturity period. |
| Reason (R): | GAs lead to early seed production in conifers. |
| 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: Gibberellin |
80%
From NCERT
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Given below are two statements:
| Assertion (A): | Ethylene helps the plants to increase their absorption surface. |
| Reason (R): | Ethylene promotes root growth and root hair formation. |
| 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: Ethylene |
82%
From NCERT
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Given below are two statements:
| Assertion (A): | Ethylene is one of the most widely used PGR in agriculture. |
| Reason (R): | Ethylene regulates many physiological processes of plants. |
| 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: Ethylene |
88%
From NCERT
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Given below are two statements:
| Assertion (A): | Winter varieties are planted in autumn. |
| Reason (R): | Winter varieties, if planted in spring, they normally fail to flower or to produce mature grain within a span of a flowering season. |
| 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: Vernalization (OLD NCERT) |
84%
From NCERT
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Given below are two statements:
| Assertion (A): | Development in plants is considered the sum of growth and differentiation. |
| Reason (R): | Development in plants is under the control of intrinsic factors only. |
| 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: Growth |
88%
From NCERT
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Given below are two statements:
| Assertion (A): | Auxins have been used extensively in agricultural and horticultural practices. |
| Reason (R): | GA3 accelerates the yield of malt from barley grains. |
| 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: Growth Hormones & Auxin | Gibberellin |
81%
From NCERT
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Given below are two statements:
| Assertion (A): | Plant exhibits plasticity in development. |
| Reason (R): | Plants follow different pathways in response to the environment or phases of life to form different kinds of structures. |
| 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: Development | Seed Dormancy (OLD NCERT) |
83%
From NCERT
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