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Q. No.Which plant growth regulator (PGR) promotes root growth and root hair formation, thus helping the plants increase their absorption surface?
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
Subtopic: Ethylene |
76%
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Ethylene:
1. Only I is correct
2. Only II is correct
3. Both I and II are incorrect
4. Both I and II are correct
| I: | is used to initiate flowering and for synchronising fruit-set in pineapples. |
| II: | induces flowering in mangoes. |
1. Only I is correct
2. Only II is correct
3. Both I and II are incorrect
4. Both I and II are correct
Subtopic: Ethylene |
82%
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Ethephon:
1. Only I and II are correct
2. Only III is incorrect
3. Only I is correct
4. I, II and III are incorrect
| I: | retards fruit ripening in tomatoes and apples. |
| II: | retards abscission in flowers and fruits in cotton, cherry, walnut. |
| III: | promotes male flowers in cucumbers thereby decreasing the yield. |
1. Only I and II are correct
2. Only III is incorrect
3. Only I is correct
4. I, II and III are incorrect
Subtopic: Ethylene |
81%
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Consider the two statements:
| Assertion(A): | ABA is also called the stress hormone. |
| Reason(R): | ABA plays an important role in seed development, maturation and dormancy. |
| 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: Abscisic Acid |
71%
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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: | There are a number of events in the life of a plant where more than one PGR interact to affect that event, e.g., dormancy in seeds/buds, abscission, senescence, apical dominance, etc. |
| Statement II: | Many of the extrinsic factors such as temperature and light, control plant growth and development via PGR such as vernalisation, flowering, dormancy, seed germination, plant movements, etc. |
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 |
91%
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All the following are physiological functions of Ethylene in plants except:
| 1. | It breaks seed and bud dormancy |
| 2. | It delays germination in peanut seeds |
| 3. | It leads to sprouting of potato tubers |
| 4. | It promotes rapid internode/petiole elongation in deep water rice plants |
Subtopic: Ethylene |
78%
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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%
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Which plant growth regulator (PGR) promotes bolting (internode elongation just prior to flowering) in beet, cabbages and many plants with rosette habits?
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
Subtopic: Gibberellin |
94%
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Consider the two statements:
| Assertion(A): | Spraying juvenile conifers with GAs delays seed production. |
| Reason(R): | Spraying juvenile conifers with GAs delays the onset of maturity period. |
| 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 False. |
Subtopic: Gibberellin |
73%
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Consider the two statements:
| Assertion (A): | GA3 is used in brewing industry. |
| Reason (R): | GA3 speeds up the malting process. |
| 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 |
90%
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