Assertion(A):
ABA is called stress hormones.
Reason(R):
ABA stimulates the opening of the stomata.
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 Abscisic Acid |
 82%
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| Assertion (A): | In an organism anabolism and catabolism take place simultaneously. |
| Reason (R): | Senescence occurs when there is an increase in the rate of anabolism with respect to catabolism. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explains (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Â Growth |Â Development |
 56%
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Which of the following plant parts perceives the photoperiod in plants?
1. meristem
2. flower
3. floral buds
4. leaves
1. meristem
2. flower
3. floral buds
4. leaves
 84%
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Apical dominance in plants can be overcome by the application of the PGR:
| 1. | Cytokinin | 2. | Ethylene |
| 3. | ABA | 4. | Gibberellins |
Subtopic: Â Cytokinin |
 86%
From NCERT
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Spraying sugarcane crops with which of the following plant growth regulators increases the stem's length, thus increasing the yield by as much as 20 tonnes per acre?
| 1. | Auxins | 2. | Gibberellins |
| 3. | Cytokinins | 4. | ABA |
Subtopic: Â Auxin Function |
 91%
From NCERT
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In plants:
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: | Growth is open |
| II: | Differentiation is open |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Growth |
 77%
From NCERT
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Which plant growth regulator is used to initiate flowering and synchronising fruit-set in pineapples?
| 1. | Gibberellins | 2. | Cytokinins |
| 3. | ABA | 4. | Ethylene |
Subtopic: Â Ethylene |
 84%
From NCERT
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Seed dormancy can be due to the presence of chemical inhibitors which include all the following except:
1. abscisic acids
2. phenolic acids
3. para-ascorbic acid
4. gibberellic acid
 84%
From NCERT
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Which PGR stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses?
| 1. | Abscisic acid | 2. | Ethylene |
| 3. | Auxins | 4. | Cytokinins |
Subtopic: Â Abscisic Acid |
 95%
From NCERT
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Consider the given two statements:
| Assertion (A): | Plant growth is intimately linked to the water status of the plant. |
| Reason (R): | The plant cells grow in size by cell enlargement, which in turn requires water. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (A) |
| 3. | Both (A) and (R) are True and but (R) does not correctly explain (A) |
| 4. | (A) is False but (R) is True |
Subtopic: Â Growth |
 86%
From NCERT
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