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: Cytokinin |
83%
From NCERT
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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: Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
83%
From NCERT
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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: Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
72%
From NCERT
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The names of Skoog and Miller are associated with the discovery of:
| 1. | Cytokinins | 2. | Ethylene |
| 3. | Jasmonates | 4. | GAs |
Subtopic: Cytokinin |
86%
From NCERT
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Kinetin was first discovered from:
| 1. | Herring sperm DNA | 2. | Coconut milk |
| 3. | Yeast extract | 4. | Corn kernels |
Subtopic: Cytokinin |
78%
From NCERT
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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: Gibberellin | Cytokinin |
82%
From NCERT
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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: Cytokinin |
83%
From NCERT
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Consider the given two statements:
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
| 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: Growth Hormones & Auxin | Cytokinin |
93%
From NCERT
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Cytokinins do not help in:
1. Production of new leaves
2. Lateral shoot growth
3. Adventitious shoot formation
4. Promotion of apical dominance
Subtopic: Growth Hormones & Auxin | Cytokinin |
82%
From NCERT
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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: Cytokinin |
61%
From NCERT
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