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Q. No.Which of the following will be true for cells in the meristematic zone at root apex?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | They are rich in protoplasm, possess large conspicuous nuclei. |
| II: | Their cell walls are primary in nature, thin and cellulosic with abundant plasmodesmatal connections. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Â Growth |
 91%
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Which one of the following generally acts as an antagonist to Gibberellins?
1. Ethylene
2. ABA
3. IAA
4. Zeatin
Subtopic: Â Abscisic Acid |
 86%
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AIPMT - 2012
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What shaped curve is a characteristic of living organism growing in a natural environment?
1. S shaped
2. J shaped
3. Rectangular hyperbola
4. A straight line
1. S shaped
2. J shaped
3. Rectangular hyperbola
4. A straight line
Subtopic: Â Growth |
 87%
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Which of the following growth regulators is an adenine derivative ?
| 1. | Auxin | 2. | Cytokinin |
| 3. | Ethylene | 4. | Abscisic acid |
Subtopic: Â Growth Hormones & Auxin |
 75%
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NEET - 2022
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How many of the given pairs are correctly matched?
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Indole compounds : IAA |
| II: | Adenine derivatives : kinetin |
| III: | Derivatives of carotenoids : GA3 |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Â Growth Hormones & Auxin |
 72%
From NCERT
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Consider the given two statements:
| Statement I: | Ethylene helps leaves/upper parts of the shoot of deep water rice plants to remain above water. |
| Statement II: | Ethylene promotes rapid internode/petiole elongation in deep water rice plants. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Ethylene |
 87%
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Research on a fungal disease of rice provided the first clues about the plant hormone
1. auxin
2. gibberellin
3. cytokinin
4. ethylene
1. auxin
2. gibberellin
3. cytokinin
4. ethylene
Subtopic: Â Gibberellin |
 94%
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Subtopic: Â Abscisic Acid |
 86%
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Consider the given two statements:
| Statement I: | In cotton, coriander and larkspur, the leaves of the juvenile plant are different in shape from those in mature plants. |
| Statement II: | In buttercup, shapes of leaves produced in air and those produced in water are different. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Development |
 95%
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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: Â Gibberellin |
 80%
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NEET - 2023
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