Q. No.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.
In the light of the above statements choose the correct answer from the options given below:
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To promote stem elongation, gibberellins act in concert with:
| 1. Auxins | 2. Cytokinins |
| 3. Ethylene | 4. ABA |
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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.
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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Normally, when the seeds are mature, ethylene production increases and builds-up within the fruit, resulting in a climactic event that means:
| 1. A sudden spurt of growth | 2. Leaf expansion |
| 3. Rise in respiratory rate | 4. Death of radicle |
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Cytokinins do not help in:
1. Production of new leaves
2. Lateral shoot growth
3. Adventitious shoot formation
4. Promotion of apical dominance
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