In most situations, ABA acts as an antagonist to:
1. | Auxins | 2. | GAs |
3. | Ethylene | 4. | Cytokinins |
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Identify the plant growth regulator that is not correctly matched to its chemical nature in the following given options:
|
PGR |
Chemical nature |
1. |
Ethylene |
Gaseous |
2. |
Adenine derivatives |
Kinetin |
3. |
Indole compounds |
Auxins |
4. |
Terpenes |
Abscisic acid |
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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 |
Match the following concerning the activity/function and the phytohormone involved:-
(a) | Fruit ripener | (i) | Abscisic acid |
(b) | Herbicide | (ii) | GA 3 |
(c) | Bolting agent | (iii) | 2, 4-D |
(d) | Stress hormone | (iv) | Ethephon |
Select the correct option from following:-
(a) | (b) | (c) | (d) | |
1. | (ii) | (iii) | (iv) | (i) |
2. | (iii) | (iv) | (ii) | (i) |
3. | (iv) | (iii) | (ii) | (i) |
4. | (iv) | (ii) | (i) | (iii) |
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PGR causing the closure of stomata in response to water stress is:
1. | ABA | 2. | Gibberellins |
3. | Auxin | 4. | Cytokinin |
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