Identify the incorrectly matched pair:
Scientist | PGR discovery | |
1. | Cousins | Ethylene |
2. | Kurosawa | Gibberellin |
3. | Skoog and Miller | ABA |
4. | F. W. Went | Auxin |
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 |
I: | Auxins, gibberellins and cytokinins are plant growth promoters. |
II: | ABA is an inhibitor of plant growth activities. |
III: | Ethylene is largely a plant growth promoter. |
1. | ABA | 2. | IAA |
3. | Ethylene | 4. | GA |
1. | Breaking seed and bud dormancy |
2. | Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings |
3. | Enhancement of respiration rate during ripening of fruits |
4. | Closure of stomata during water stress |
I: | It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. |
II: | It promotes senescence and abscission of plant organs especially of leaves and flowers. |
III: | It enhances the respiration rate during ripening of the fruits. |
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 |
1. | It breaks seed and bud dormancy |
2. | It initiates germination in peanut seeds |
3. | It does not allow sprouting of potato tubers |
4. | It promotes root growth and root hair formation. |
1. | It breaks seed and bud dormancy |
2. | It delays germination in peanut seeds |
3. | It leads to sprouting of potato tubers |
4. | It promotes rapid internode/petiole elongation in deep water rice plants |