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Q. No.Which plant growth regulator is used to initiate flowering and synchronising fruit-set in pineapples?
1. Gibberellins
2. Cytokinins
3. ABA
4. Ethylene
1. Gibberellins
2. Cytokinins
3. ABA
4. Ethylene
Subtopic: 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
Subtopic: Seed Dormancy (OLD NCERT) |
85%
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: Abscisic Acid |
94%
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: Growth |
85%
From NCERT
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All the following plants exhibit difference in shape of leaves in juvenile and in mature phase of their life cycle except:
1. Cotton
2. Coriander
3. Larkspur
4. Buttercup
1. Cotton
2. Coriander
3. Larkspur
4. Buttercup
Subtopic: Development |
77%
From NCERT
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All the following are known functions of the plant growth regulator auxins except:
1. Promotion of flowering in pineapples
2. Induction of parthenocarpy in tomatoes
3. Fruit ripening in tomatoes
4.`Initiation of rooting in stem cuttings
1. Promotion of flowering in pineapples
2. Induction of parthenocarpy in tomatoes
3. Fruit ripening in tomatoes
4.`Initiation of rooting in stem cuttings
Subtopic: Growth Hormones & Auxin | Ethylene |
84%
From NCERT
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Regarding plant growth regulators:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | Auxins are plant growth promoters |
| II: | ABA is a plant growth inhibitor |
| III: | Ethylene is largely an inhibitor of growth activities |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Growth Hormones & Auxin |
85%
From NCERT
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below
| Statement I: | The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as dedifferentiation. |
| Statement II: | The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called plasticity. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Both Statement I and Statement II are correct |
| 4. | Both Statement I and Statement II are incorrect |
Subtopic: Development | Differentiation, Dedifferentiation and Redifferentiation |
85%
From NCERT
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Which hormone promotes internode / petiole elongation in deep water rice?
| 1. | 2, 4-D | 2. | GA3 |
| 3. | Kinetin | 4. | Ethylene |
Subtopic: Ethylene |
69%
From NCERT
NEET - 2023
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In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as
| 1. | Senescence | 2. | Differentiation |
| 3. | Dedifferentiation | 4. | Development |
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
58%
NEET - 2023
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