Q. No.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 ‘bakanae’ (foolish seedling) disease of rice seedlings is associated with the discovery of:
1. Auxins
2. Gibberellins
3. Ethylene
4. Abscisic acid
1. Auxins
2. Gibberellins
3. Ethylene
4. Abscisic acid
Subtopic: Gibberellin |
95%
From NCERT
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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 |
82%
From NCERT
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How many of the following can be characterized as action of gibberellins on plants?
| I: | They can be used to increase the length of grape stalks. |
| II: | They can elongate and improve the shape of apple. |
| III: | They speed up malting process in brewing industry. |
| IV: | They hasten the maturity period of juvenile conifers. |
| V: | They promote bolting in many plants with rosette habit. |
| 1. 2 | 2. 3 |
| 3. 4 | 4. 5 |
Subtopic: Gibberellin |
80%
From NCERT
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Consider the given two statements:
| Assertion (A): | Gibberellins are used for apple shaping. |
| Reason (R): | Gibberellins stimulate the elongation of apple cells, enhancing their symmetry and size. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Gibberellin |
88%
From NCERT
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To extend their market period, fruits can be left on trees longer by the application of:
| 1. | Auxin | 2. | Gibberellins |
| 3. | Cytokinin | 4. | ABA |
Subtopic: Gibberellin |
77%
From NCERT
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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%
From NCERT
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Consider the given two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
| I: | Spraying sugarcane crop with gibberellins increases the yield by as much as 20 tonnes per acre. |
| II: | Sugarcane stores carbohydrates as sugar in their stems and spraying sugarcane crop with gibberellins increases the length of the stem. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Subtopic: Gibberellin |
88%
From NCERT
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