Q. No.A plant has been forcibly put into a horizontal position. After some time, the tip of this plant grows:
1. upwards.
2. downwards.
3. straight horizontally.
4. unpredictably.
1. upwards.
2. downwards.
3. straight horizontally.
4. unpredictably.
A piece of parenchyma tissue from a plant is cultured in the absence of cytokinins. The expected result is that:
| 1. | the cells grow smaller with each division. |
| 2. | the cells grow very large but do not divide. |
| 3. | the cells grow very smalland do not divide. |
| 4. | the cells grow large and divide more rapidly than normal. |
In a tissue culture experiment, the undifferentiated callus will develop shoot buds if:
| 1. | amount of auxin and cytokinin is equal in the medium |
| 2. | amount of auxin is more than the amount of cytokinin in the medium |
| 3. | amount of cytokinin is more than the amount of auxin in the medium |
| 4. | the medium lacks auxin and cytokinin but has other plant growth regulators |
Plant growth regulators do not:
| 1. | act by altering gene expression. |
| 2. | have multiple effects. |
| 3. | function independently of other hormones. |
| 4. | control cell division and cell differentiation |
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
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. |
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