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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
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The formation of interfascicular cambium in plants is due to:-
1. Non-differentiation
2. Re-differentiation
3. Differentiation
4. De-differentiation
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Heterophyllous development due to environment is an example of:-
1. Developmental noise
2. Norm of the reaction
3. Convergence
4. Plasticity
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Gibberellic acid is a/an:-
1. lndole compound
2. Terpene
3. Adenine derivative
4. Carotenoid
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The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:
1. Abscisic acid
2. Cytokinin
3. Auxin
4. Ethylene
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Cytokinin does not help in:
1. Lateral shoot growth
2. Overcoming apical dominance
3. Adventitious shoot formation
4. Promoting leaf senescence
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In most situations, which of the following acts as an antagonist to GAs?
1. ABA
2. IAA
3. Kinetin
4. Ethylene
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Which of the following is the site for perception of light/dark in plants?
1. Root apex
2. Shoot apex
3. Leaves
4. Flower
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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.
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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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