In order to increase the yield of sugarcane crops, which of the following plant growth regulators should be sprayed?

1. Ethylene 2. Auxins
3. Gibberellins 4. Cytokinins

Subtopic:  Gibberellin |
 87%
From NCERT
NEET - 2019
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Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:

1. Gibberellins prevent bolting and are inactivated.
2.  Auxins prevent leaf drop at early stages.
3. Effect of auxins is removed and the growth of lateral buds is enhanced.
4.  Gibberellins delay the senescence of leaves.

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 82%
From NCERT
NEET - 2019
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What is the site of perception of photoperiod necessary for induction of flowering in plants?

1. Leaves

2. Lateral buds

3. Pulvinus

4. Shoot apex

Subtopic:  Photoperiodism (OLD NCERT) |
 85%
From NCERT
NEET - 2019
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It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Cytokinin and Abscisic acid

2. Auxin and Ethylene

3. Gibberellin and Cytokinin

4. Gibberellin and Abscisic acid

Subtopic:  Auxin Function | Ethylene |
 79%
From NCERT
NEET - 2019
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Which one of the following pairs is not correctly matched?

1. Abscisic acid - Stomatal closure
2. Gibberellic acid - Leaves fall
3. Cytokinin - Cell division
4. IAA - Cell wall elongation
Subtopic:  Gibberellin |
 74%
From NCERT
AIPMT - 2007
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"Foolish seedling" disease of rice led to the discovery of:

1. GA

2. ABA

3. 2, 4-D

4. IAA

Subtopic:  Gibberellin |
 89%
From NCERT
AIPMT - 2007
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Which one of the following acids is a derivative of carotenoids?

1. Indole-butyric acid

2. Indole-3-acetic acid

3. Gibberellic acid

4. Abscisic acid

Subtopic:  Abscisic Acid |
 71%
From NCERT
AIPMT - 2009
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One of the synthetic auxin is:

1. NAA

2. IAA

3. GA

4. IBA

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 84%
From NCERT
AIPMT - 2009
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Which one of the following growth regulators is known as the stress hormone?

1. Abscisic acid

2. Ethylene

3. GA3

4. Indole acetic acid

Subtopic:  Abscisic Acid |
 94%
From NCERT
AIPMT - 2014
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The typical growth curve in plants is:

1. sigmoid
2. linear
3. stair-steps shaped
4. parabolic
Subtopic:  Growth Model |
 87%
From NCERT
NEET - 2015
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