Q. No.Identify the incorrectly matched pair:
PGR
Chemical nature
1.
Auxins
Indole compounds
2.
Cytokinin
Pyrimidine derivatives
3.
ABA
Carotenoid derivative
4.
Gibberellic acid
Terpenes
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Identify the plant growth regulator that, though is largely an inhibitor but, can be placed in both plant growth promoter and plant growth inhibitor groups?
| 1. Auxins | 2. Gibberellins |
| 3. Ethylene | 4. Abscisic acid |
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Identify the incorrectly matched pair:
| Scientist | PGR discovery | |
| 1. | Cousins | Ethylene |
| 2. | Kurosawa | Gibberellin |
| 3. | Skoog and Miller | ABA |
| 4. | F. W. Went | Auxin |
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Auxin does not:
1. Help to initiate rooting in stem cuttings
2. Promote female flowers in cucumbers
3. Prevent fruit and leaf drop in early stages
4. Promote abscission of older mature leaves and fruits
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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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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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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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In most situations, which PGR acts as an antagonist to GAs?
| 1. ABA | 2. Ethylene |
| 3. Cytokinin | 4. Giberrellin |
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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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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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