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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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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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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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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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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Vernalisation stimulates flowering in:
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand

 72%
From NCERT
AIPMT - 2012
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Which one of the following generally acts as an antagonist to Gibberellins?
1. Ethylene
2. ABA
3. IAA
4. Zeatin

Subtopic:  Abscisic Acid |
 86%
From NCERT
AIPMT - 2012
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One of the commonly used plant growth hormone in tea plantations is:

1. Abscisic acid 2. Zeatin
3. Indole-3- acetic acid 4. Ethylene
Subtopic:  Growth Hormones & Auxin |
 78%
From NCERT
AIPMT - 2010
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