Q. No.The control of apical dominance is due to interaction of auxins, cytokinins and a newly discovered plant hormone called as:
1. Brassinosteroids
2. Jasmonates
3. Salicylic acid
4. Strigolactones
1. Brassinosteroids
2. Jasmonates
3. Salicylic acid
4. Strigolactones
To promote stem elongation, gibberellins act in concert with:
| 1. | Auxins | 2. | Cytokinins |
| 3. | Ethylene | 4. | ABA |
Identify the incorrect statement regarding gibberellins:
| 1. | All are acidic |
| 2. | Cause bolting in plants with rosette habit |
| 3. | Delay the maturity period of juvenile conifers |
| 4. | Speed up malting process in brewing industry |
The removal or inactivation of which of the following will lead to germination of many types of dormant seeds?
| 1. | ABA | 2. | Ethylene |
| 3. | Cytokinins | 4. | Gibberellins |
Many mutants that are especially prone to wilting are deficient in:
1. ABA
2. Ethylene
3. Cytokinins
4. Gibberellins
The fact that various plant hormones can have different effects at different concentrations can explain:
| 1. | Need of photoperiodism for flowering in plants. |
| 2. | Plant hormones being needed in vary high amounts. |
| 3. | Antagonism between auxin and cytokinin in the control of apical dominance. |
| 4. | Cell elongation stimulation in apical meristems and inhibition axillary buds by auxins. |
Hyponastic response in submerged plants may be due to auxin and:
1. ABA
2. Ethylene
3. Cytikinin
4. Gibberellins
The ‘triple response to mechanical stress’ is related to the plant growth regulator:
1. Ethylene
2. ABA
3. Auxin
4. Cytokinin
To render the cells of abscission layer more sensitive to ethylene, an aging leaf produces less and less:
1. Cytokinin
2. Auxin
3. Gibberellin
4. ABA
The newly discovered PGR brassinosteroids have effects qualitatively similar to:
1. Auxins
2. Gibberellins
3. Cytokinins
4. Ethylene
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