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Q. No.
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
1. promotes abscission of mature leaves only.
2. does not affect mature monocotyledonous plants.
3. can help in cell division in grasses, to produce growth.
4. promotes apical dominance
Subtopic:  Growth Hormones & Auxin | Auxin Function |
 70%
From NCERT
NEET - 2024
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F. Skoog observed that callus proliferated from the internodal segments of tobacco stem when auxin was supplied with one of the following, except:
1. Extract of vascular tissues 
2. Coconut milk
3. Abscisic acid
4. Yeast extract 
Subtopic:  Growth Hormones & Auxin |
 76%
From NCERT
NEET - 2024
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Given below are some statements about plant growth regulators: 
A. All GAs are acidic in nature. 
B. Auxins are antagonists to GAs.
C. Zeatin was isolated from coconut milk.
D. Ethylene induces flowering in Mango.
E. Abscisic acid induces parthenocarpy.
Choose the correct set of statements from the ones given below:
1. A,C,D 2. B,E
3. A,B,C 4. B,D,E
Subtopic:  Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
 78%
From NCERT
NEET - 2024
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The phenomenon which is influenced by auxin and also played a major role in its discovery is:
1. Phototropism 2. Root initiation
3. Gravitropism 4. Apical Dominance
Subtopic:  Growth Hormones & Auxin |
 63%
From NCERT
NEET - 2023
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Removal of apical dominance by decapitation is utilised for: 

1. Suppressing the activity of intercalary meristem 
2. Early senescence 
3. Hedge making 
4. Preparing weed-free lawns
Subtopic:  Growth Hormones & Auxin | Auxin Function |
 80%
From NCERT
NEET - 2022
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Which of the following growth regulators is an adenine derivative ?
1.Auxin2.Cytokinin
3.Ethylene4.Abscisic acid
Subtopic:  Growth Hormones & Auxin |
 75%
From NCERT
NEET - 2022
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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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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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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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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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