Q. No.Identify the incorrectly matched pair:
| PGR | Chemical nature | |
| 1. | Auxins | Indole compounds |
| 2. | Cytokinin | Pyrimidine derivatives |
| 3. | ABA | Carotenoid derivative |
| 4. | Gibberellic acid | Terpenes |
Subtopic: Â Cytokinin |
 83%
Level 1: 80%+
Hints
Identify the incorrectly matched pair:
| Scientist | PGR discovery | |
| 1. | Cousins | Ethylene |
| 2. | Kurosawa | Gibberellin |
| 3. | Skoog and Miller | ABA |
| 4. | F. W. Went | Auxin |
Subtopic: Â Gibberellin |Â Cytokinin |Â Ethylene |Â Abscisic Acid |
 82%
Level 1: 80%+
Hints
Identify the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Auxins, gibberellins and cytokinins are plant growth promoters. |
| II: | ABA is an inhibitor of plant growth activities. |
| III: | Ethylene is largely a plant growth promoter. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Â Growth Hormones & Auxin |Â Gibberellin |Â Cytokinin |Â Ethylene |Â Abscisic Acid |
 77%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
The names of Skoog and Miller are associated with the discovery of:
| 1. | Cytokinins | 2. | Ethylene |
| 3. | Jasmonates | 4. | GAs |
Subtopic: Â Cytokinin |
 88%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Kinetin was first discovered from:
| 1. | Herring sperm DNA | 2. | Coconut milk |
| 3. | Yeast extract | 4. | Corn kernels |
Subtopic: Â Cytokinin |
 81%
Level 1: 80%+
Hints
Consider the two statements:
| Assertion (A): | Gibberellins are used to increase the length of grape stalks. |
| Reason (R): | Gibberellins help overcome apical dominance. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Â Gibberellin |Â Cytokinin |
 78%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
All the following statements regarding cytokinins are true except:
| 1. | They were discovered as kinetin, a modified form of adenine. |
| 2. | Zeatin was isolated from corn-kernels and coconut milk. |
| 3. | Kinetin occurs widely in almost all plants. |
| 4. | Natural cytokinins are synthesized in region where rapid cell division occurs. |
Subtopic: Â Cytokinin |
 79%
Level 2: 60%+
Hints
Consider the given two statements:
| Statement I: | Kinetin, a modified form of adenine, a purine, was discovered from the autoclaved herring sperm DNA. |
| Statement II: | Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Growth Hormones & Auxin |Â Cytokinin |
 92%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Cytokinins do not help in:
| 1. | Production of new leaves |
| 2. | Lateral shoot growth |
| 3. | Adventitious shoot formation |
| 4. | Promotion of apical dominance |
Subtopic: Â Growth Hormones & Auxin |Â Cytokinin |
 81%
Level 1: 80%+
Hints
Cytokinins help in delay of leaf senescence because they:
| 1. | Promote new leaves formation |
| 2. | Help overcome apical dominance |
| 3. | Help in chloroplast formation in leaves |
| 4. | Promote nutrient mobilization |
Subtopic: Â Cytokinin |
 64%
Level 2: 60%+
Hints
© 2026 GoodEd Technologies Pvt. Ltd.