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Q. No.Consider the given two statements:
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%
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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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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%
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Cytokinins:
| I: | Help produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious root formation. |
| II: | Help overcome the apical dominance. |
| III: | Promote nutrient mobilisation, which helps in the delay of leaf senescence. |
| 1. Only I and II | 2. Only I and III |
| 3. Only II and III | 4. I, II and III |
Subtopic: Cytokinin |
82%
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Which gaseous PGR is synthesised in large amounts by tissues undergoing senescence and ripening fruits
| 1. | ABA | 2. | IAA |
| 3. | Ethylene | 4. | GA |
Subtopic: Ethylene |
94%
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Which of the following is not a function of the PGR ethylene?
1. Vertical growth of seedlings
2. Swelling of axis of dicot seedlings
3. Apical hook formation in dicot seedlings
4. Fruit ripening
1. Vertical growth of seedlings
2. Swelling of axis of dicot seedlings
3. Apical hook formation in dicot seedlings
4. Fruit ripening
Subtopic: Ethylene |
80%
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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: | The most widely used compound as source of ethylene is ethephon. |
| II: | Ethephon in an aqueous solution is readily absorbed and transported within the plant and releases ethylene slowly. |
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: Ethylene |
81%
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Ethylene does not:
1. induce flowering in mango
2. hasten fruit ripening in tomatoes and apples
3. retard abscission of flowers and fruits in cotton cherry and walnut
4. promote female flowers in cucumbers
1. induce flowering in mango
2. hasten fruit ripening in tomatoes and apples
3. retard abscission of flowers and fruits in cotton cherry and walnut
4. promote female flowers in cucumbers
Subtopic: Ethylene |
75%
From NCERT
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In certain plants, flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This phenomenon is termed:
1. Pseudo-Dormancy
2. Thermonasty
3. Vernalisation
4. Scarification
1. Pseudo-Dormancy
2. Thermonasty
3. Vernalisation
4. Scarification
Subtopic: Vernalization (OLD NCERT) |
96%
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Consider the given two statements:
| I: | Vernalisation enables the plant to have sufficient time to reach maturity. |
| II: | It prevents precocious reproductive development late in the growing season. |
| 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: Vernalization (OLD NCERT) |
78%
From NCERT
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