- 1(current)
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 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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Kinetin was first discovered from:
| 1. Herring sperm DNA | 2. Coconut milk |
| 3. Yeast extract | 4. Corn kernels |
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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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Cytokinins help in delay of leaf senescence because they:
1. Promote new leaves formation
2. Help overcome apical dominance
3. Help in chloroplast formation in leaves
4. Promote nutrient mobilization
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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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1. They were discovered as kinetin, a modified form of adenine.
2. Zeatin was isolated from corn-kernels and coconut milk.
3. Kinetin occurs widely in almost all plants.
4. Natural cytokinins are synthesized in region where rapid cell division occurs.
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I. Help produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious root formation.
II. Help overcome the apical dominance.
III. Promote nutrient mobilisation, which helps in the delay of leaf senescence.
| 1. Only I and II | 2. Only I and III |
| 3. Only II and III | 4. I, II and III |
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- 1(current)
Q. No.
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