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
Subtopic:  Ethylene |
 56%
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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

Subtopic:  Differentiation, Dedifferentiation and Redifferentiation |
 65%
From NCERT
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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

Subtopic:  Development |
 94%
From NCERT
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Gibberellic acid is a/an:-
1. lndole compound
2. Terpene
3. Adenine derivative
4. Carotenoid

Subtopic:  Gibberellin |
 74%
From NCERT
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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
 

Subtopic:  Ethylene |
 59%
From NCERT
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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

Subtopic:  Cytokinin |
 71%
From NCERT
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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

Subtopic:  Abscisic Acid |
 81%
From NCERT
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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

Subtopic:  Photoperiodism (OLD NCERT) |
 78%
From NCERT
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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.

Subtopic:  Photoperiodism (OLD NCERT) |
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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.

Subtopic:  Gibberellin |
 83%
From NCERT
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