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Q. No.During mid-1960s, three independent researches reported the purification and chemical characterisation of three different kinds of inhibitors: inhibitor-B, abscission II and dormin. Later all the three were proved to be chemically identical. It was named:
1. Indole-3-acetic acid
2. N6-furfurylamino purine
3. Abscisic acid
4. Gibberellic acid
Subtopic: Abscisic Acid |
93%
From NCERT
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Consider the given two statements:
Statement I: Auxins like NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) have been isolated from plants.
Statement II: IAA and indole butyric acid (IBA) are synthetic auxins.
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 incorrect
4. Statement I is incorrect; Statement II is correct
Statement I: Auxins like NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) have been isolated from plants.
Statement II: IAA and indole butyric acid (IBA) are synthetic auxins.
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 incorrect
4. Statement I is incorrect; Statement II is correct
Subtopic: Growth Hormones & Auxin |
84%
From NCERT
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Consider the two statements:
| Assertion(A): | Apical dominance is most likely adaptive. |
| Reason(R): | It is important for the plant to devote energy to growing upward so that it can get more light to undergo photosynthesis. |
| 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: Growth Hormones & Auxin |
74%
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One of the first gibberellins to be discovered and also the one that remains the most intensively studied form is:
1. GA1
2. GA2
3. GA3
4. GA4
1. GA1
2. GA2
3. GA3
4. GA4
Subtopic: Gibberellin |
96%
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 |
81%
From NCERT
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Consider the two statements:
Assertion: Spraying sugarcane crop with gibberellins increases the yield by as much as 20 tonnes per acre.
Reason: Spraying sugarcane crop with gibberellins increases the length of the stem.
1. Both Assertion and Reason are true and Reason correctly explains the Assertion.
2. Both Assertion and Reason are true but Reason does not correctly explain the Assertion.
3. Assertion is true; Reason is false.
4. Assertion is false; Reason is true.
Assertion: Spraying sugarcane crop with gibberellins increases the yield by as much as 20 tonnes per acre.
Reason: Spraying sugarcane crop with gibberellins increases the length of the stem.
1. Both Assertion and Reason are true and Reason correctly explains the Assertion.
2. Both Assertion and Reason are true but Reason does not correctly explain the Assertion.
3. Assertion is true; Reason is false.
4. Assertion is false; Reason is true.
Subtopic: Gibberellin |
90%
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 occurs naturally in plants. |
| Statement II: | Zeatin does not occur naturally in plants. |
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: Cytokinin |
75%
From NCERT
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Natural cytokinins are synthesised in all the following regions in a plant except:
1. Root apices
2. Developing shoot buds
3. Young fruits
4. Senescent organs
1. Root apices
2. Developing shoot buds
3. Young fruits
4. Senescent organs
Subtopic: Cytokinin |
87%
From NCERT
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Ethylene enhances the respiration rate during ripening of the fruits. This rise in rate of respiration is called:
1. respiratory climactic.
2. utilisation coefficient.
3. respiratory hyperpnea.
4. oxygen debt.
1. respiratory climactic.
2. utilisation coefficient.
3. respiratory hyperpnea.
4. oxygen debt.
Subtopic: Ethylene |
96%
From NCERT
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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%
From NCERT
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