Q. No.The removal or inactivation of which of the following will lead to germination of many types of dormant seeds?
1. ABA
2. Ethylene
3. Cytokinins
4. Gibberellins
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Flowering will take place in a short day plant only when:
1. days are shorter than nights.
2. days are shorter than a certain critical value.
3. nights are shorter than a certain critical value.
4. nights are longer than a certain critical value.
To promote stem elongation, gibberellins act in concert with:
| 1. Auxins | 2. Cytokinins |
| 3. Ethylene | 4. ABA |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Plants retain the capacity for unlimited growth throughout their life. |
| Reason (R): | Plants have meristems at certain locations in their body. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
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Plasticity in plant growth means that
1. Plant roots are extensible
2. Plant growth is dependent on the environment
3. Stems can extend
4. None of the above
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The term synergistic action of hormones refers to
1. When two hormones act together but bring about opposite effects.
2. When two hormone act together and contribute to the same function.
3. When one hormone affects more than one function.
4. When many hormones bring about any one function.
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Match the following :
| A. IAA | i. Herring sperm DNA |
| B. ABA | ii. Bolting |
| C. Ethylene | iii. Stomatal closure |
| D. GA | iv. Weed-free lawns |
| E. Cytokinins | v. Ripening of fruits |
Options:
| A | B | C | D | E | |
| 1. | iv | iii | v | ii | i |
| 2. | v | iii | iv | ii | i |
| 3. | iv | i | v | iii | ii |
| 4. | v | iii | ii | i | iv |
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The site of perception of light/dark duration in plants is:
1. Root apex
2. Shoot apex
3. Flower
4. Leaves
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In most situations, which PGR acts as an antagonist to GAs?
| 1. ABA | 2. Ethylene |
| 3. Cytokinin | 4. Giberrellin |
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Which PGR stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stress?
| 1. Cytokinin | 2. Giberrellin |
| 3. ABA | 4. Ethylene |
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