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

 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 |
 82%
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 |
 83%
From NCERT
NEET - 2019
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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 |
 89%
From NCERT
NEET - 2019
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Which of the following is not an inhibitory substance governing seed dormancy?

1. Abscisic acid

2. Phenolic acid

3. Para-ascorbic acid

4. Gibberellic acid

 78%
From NCERT
NEET - 2020
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Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

1. Gibberellin

2. Ethylene

3. Abscisic acid

4. Cytokinin

Subtopic:  Gibberellin |
 89%
From NCERT
NEET - 2020
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Who coined the term 'Kinetin'?

1. Skoog and Miller 2. Darwin
3. Went 4. Kurosawa
Subtopic:  Growth Hormones & Auxin |
 85%
From NCERT
NEET - 2020
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Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:
1. Gibberellic acid
2. Nitrate
3. Ascorbic acid
4. Chilling conditions

 56%
From NCERT
NEET - 2020
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Match the following concerning the activity/function and the phytohormone involved:

Column I Column II
(a) Fruit ripener      (i) Abscisic acid
(b) Herbicide (ii) GA 3
(c) Bolting agent    (iii) 2, 4-D
(d) Stress hormone (iv) Ethephon


Select the correct option from following:

Options: (a) (b) (c) (d)
1. (ii) (iii) (iv) (i)
2. (iii) (iv) (ii) (i)
3. (iv) (iii) (ii) (i)
4. (iv) (ii) (i) (iii)
Subtopic:  Growth Hormones & Auxin | Gibberellin | Ethylene | Abscisic Acid |
 86%
From NCERT
NEET - 2020
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The plant hormone used to destroy weeds in a field is:

1. 2, 4-D 2. IBA
3. IAA 4. NAA
Subtopic:  Auxin Function |
 89%
From NCERT
NEET - 2021
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