Q. No.Which of the following is not an action of ethylene?
| 1. | Induces leaf abscission |
| 2. | Inhibits root hair growth - decreasing the efficiency of water and mineral absorption |
| 3. | Induces the growth of adventitious roots during flooding |
| 4. | Stimulates epinasty - leaf petiole grows out, leaf hangs down and curls into itself |
The formation of interfascicular cambium in plants is due to:-
1. Non-differentiation
2. Re-differentiation
3. Differentiation
4. De-differentiation
Heterophyllous development due to environment is an example of:-
1. Developmental noise
2. Norm of the reaction
3. Convergence
4. Plasticity
The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:
1. Abscisic acid
2. Cytokinin
3. Auxin
4. Ethylene
Cytokinin does not help in:
1. Lateral shoot growth
2. Overcoming apical dominance
3. Adventitious shoot formation
4. Promoting leaf senescence
In most situations, which of the following acts as an antagonist to GAs?
1. ABA
2. IAA
3. Kinetin
4. Ethylene
Which of the following is the site for perception of light/dark in plants?
1. Root apex
2. Shoot apex
3. Leaves
4. Flower
A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
1. cause increased flower production.
2. have no effect upon flowering.
3. inhibit flowering.
4. stimulate flowering.
Which of the following statements about plant hormones is false?
| 1. | The growth of plants in nature is probably regulated by a combination of growth-stimulating and growth-inhibiting hormones. |
| 2. | Abscisic acid generally promotes growth. |
| 3. | Gibberellins stimulate cell enlargement. |
| 4. | Cytokinins promote cell division. |
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