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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
Subtopic: Ethylene |
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Level 1: 80%+
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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
83%
Level 1: 80%+
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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 |
95%
Level 1: 80%+
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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 |
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Level 1: 80%+
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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%
Level 2: 60%+
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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 |
Subtopic: Growth Hormones & Auxin | Ethylene |
85%
Level 1: 80%+
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Regarding plant growth regulators:
| I: | Auxins are plant growth promoters |
| II: | ABA is a plant growth inhibitor |
| III: | Ethylene is largely an inhibitor of growth activities |
| 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 |
Subtopic: Growth Hormones & Auxin |
85%
Level 1: 80%+
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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 |
71%
Level 2: 60%+
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%
Level 3: 35%-60%
NEET - 2023
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Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?
1. Abscisic Acid
2. Indole-3-butyric Acid
3. Gibberellic Acid
4. Zeatin
1. Abscisic Acid
2. Indole-3-butyric Acid
3. Gibberellic Acid
4. Zeatin
Subtopic: Gibberellin |
80%
Level 1: 80%+
NEET - 2023
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