Q. No.Generally, plant hormones do not control plant development by affecting:
1.
the majorly citric acid cycle and the anabolic Calvin cycle
2.
cell division via the cell cycle
3.
cell elongation through acid growth
4.
mediating short-term physiological responses to environmental stimuli
The practical uses of auxins include:
| I: | Use of IBA in vegetative propagation of plants by cutting |
| II: | As a herbicide for eliminating eudicot broad-leaf weeds |
| III: | Making greenhouse cultivated tomatoes more viable commercially |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Plants bend toward light because
| 1. | light is the source of energy that drives photosynthesis. |
| 2. | the sun stimulates stem growth. |
| 3. | cell expansion is greater on the dark side of the stem. |
| 4. | there is inactivation of auxin on the dark side of the stem. |
The production of which of the following plant hormones by the apical bud of a pine tree inhibits the growth of lateral buds?
1. ABA.
2. cytokinin.
3. gibberellin.
4. auxin.
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.
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 |
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