Identify the incorrectly matched pair:
Scientist | PGR discovery | |
1. | Cousins | Ethylene |
2. | Kurosawa | Gibberellin |
3. | Skoog and Miller | ABA |
4. | F. W. Went | Auxin |
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. | 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: | acts as a general plant growth inhibitor and an inhibitor of plant metabolism. |
II: | inhibits seed germination. |
III: | stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses. |
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 |
Assertion(A): | ABA is also called the stress hormone. |
Reason(R): | ABA plays an important role in seed development, maturation and dormancy. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
3. | (A) is True; (R) is False. |
4. | (A) is False; (R) is True. |
In most situations, which PGR acts as an antagonist to GAs?
1. | ABA | 2. | Ethylene |
3. | Cytokinin | 4. | Giberrellin |