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Q. No.In most seeds, the ratio of which of the following pair of PGRs determines whether the embryo remains dormant or germinates?
1. ABA and GA 2. Auxin and Cytokinin 3. Auxin and GA 4. ABA and Cytokinin
Subtopic: Â Gibberellin |Â Abscisic Acid |
 60%
Level 2: 60%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Spraying sugarcane crops with gibberellins increase the yield by as much as 20 tonnes per acre. |
| Reason (R): | Sugarcane stores carbohydrates such as sugar in their stems. |
| 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: Â Gibberellin |
Level 3: 35%-60%
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Consider the given two statements:
| I: | Differentiation in plants is open. |
| II: | Cells/tissues arising out of the same meristem have different structures at maturity. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Â Differentiation, Dedifferentiation and Redifferentiation |
 59%
Level 3: 35%-60%
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The pineapple which under natural conditions is difficult to blossom has been made to produce fruits throughout the year by application of:
1. NAA, 2, 4-D
2. GA3
3. Cytokinin
4. IAA, IBA
1. NAA, 2, 4-D
2. GA3
3. Cytokinin
4. IAA, IBA
Subtopic: Â Auxin Function |
Level 3: 35%-60%
NEET - 2013
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The phenomenon which is influenced by auxin and also played a major role in its discovery is:
| 1. | Phototropism | 2. | Root initiation |
| 3. | Gravitropism | 4. | Apical Dominance |
Subtopic: Â Growth Hormones & Auxin |
 63%
Level 2: 60%+
NEET - 2023
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Which of the following elements for growth directly aids in increasing the plant size?
1. Temperature
2. Gravity
3. Water
4. Light
1. Temperature
2. Gravity
3. Water
4. Light
Subtopic: Â Growth |
 56%
Level 3: 35%-60%
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Consider the given two statements:
| Assertion (A): | Plant growth is intimately linked to the water status of the plant while development is not. |
| Reason (R): | The plant cells grow in size by cell enlargement which in turn requires water. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Â Growth |
 50%
Level 3: 35%-60%
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Consider the given two statements:
| Statement I: | In cotton, coriander, and larkspur, differences in the shapes of leaves produced in air and those produced in water represent heterophyllous development due to environment. |
| Statement II: | In buttercup, the leaves of the juvenile plant are different in shape from those in mature plants. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Â Development |
 56%
Level 3: 35%-60%
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Intracellular factors involved in the control of growth and development in plants will be:
1. Chemicals such as plant growth regulators
2. Physical factors like light temperature and oxygen.
3. Water
4. Genetic factors
1. Chemicals such as plant growth regulators
2. Physical factors like light temperature and oxygen.
3. Water
4. Genetic factors
Subtopic: Â Growth |Â Growth Model |Â Growth Terminology |Â Development |
 59%
Level 3: 35%-60%
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F. Skoog and his co-workers observed that from the internodal segments of tobacco stems the callus proliferated only if extracts of vascular tissues or yeast extract or coconut milk or DNA supplements the medium already containing:
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
Subtopic: Â Growth Hormones & Auxin |
Level 3: 35%-60%
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