Q. No.Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage?
| 1. | Ethephon | 2. | Abscisic acid |
| 3. | Gibberellin | 4. | Indole butyric acid |
Subtopic: Â Growth Hormones & Auxin |
 72%
Level 2: 60%+
NEET - 2026
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Which of the following plant growth regulators is used as herbicide ?
1. Gibberellin
2. 2,4-D
3. Kinetin
4. Abscisic acid
1. Gibberellin
2. 2,4-D
3. Kinetin
4. Abscisic acid
Subtopic: Â Growth Hormones & Auxin |
 74%
Level 2: 60%+
NEET - 2026
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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: Â Growth Hormones & Auxin |Â Auxin Function |
 70%
Level 2: 60%+
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
1. Extract of vascular tissues
2. Coconut milk
3. Abscisic acid
4. Yeast extract
Subtopic: Â Growth Hormones & Auxin |
 75%
Level 2: 60%+
NEET - 2024
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Given below are some statements about plant growth regulators:
Choose the correct set of statements from the ones given below:
| 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. |
| 1. | A,C,D | 2. | B,E |
| 3. | A,B,C | 4. | B,D,E |
Subtopic: Â Growth Hormones & Auxin |Â Gibberellin |Â Cytokinin |Â Ethylene |Â Abscisic Acid |
 77%
Level 2: 60%+
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: Â Growth Hormones & Auxin |
 62%
Level 2: 60%+
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: Â Growth Hormones & Auxin |Â Auxin Function |
 79%
Level 2: 60%+
NEET - 2022
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Which of the following growth regulators is an adenine derivative ?
| 1. | Auxin | 2. | Cytokinin |
| 3. | Ethylene | 4. | Abscisic acid |
Subtopic: Â Growth Hormones & Auxin |
 76%
Level 2: 60%+
NEET - 2022
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Subtopic: Â Growth Hormones & Auxin |
 85%
Level 1: 80%+
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: Â Growth Hormones & Auxin |Â Gibberellin |Â Ethylene |Â Abscisic Acid |
 87%
Level 1: 80%+
NEET - 2020
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