Identify the incorrectly matched pair:
PGR | Chemical nature | |
1. | Auxins | Indole compounds |
2. | Cytokinin | Pyrimidine derivatives |
3. | ABA | Carotenoid derivative |
4. | Gibberellic acid | Terpenes |
Identify the incorrectly matched pair:
Scientist | PGR discovery | |
1. | Cousins | Ethylene |
2. | Kurosawa | Gibberellin |
3. | Skoog and Miller | ABA |
4. | F. W. Went | Auxin |
Kinetin was first discovered from:
1. | Herring sperm DNA | 2. | Coconut milk |
3. | Yeast extract | 4. | Corn kernels |
Cytokinins do not help in:
1. Production of new leaves
2. Lateral shoot growth
3. Adventitious shoot formation
4. Promotion of apical dominance
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 |
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 |
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. |
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 |