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Q. No.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%
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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%
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Consider the given two statements:
| I: | Winter varieties of wheat are planted in autumn. |
| II: | Spring varieties of wheat are planted in winters. |
| 1. | Both I and II are correct |
| 2. | Both I and II are incorrect |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Vernalization (OLD NCERT) |
58%
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Identify the incorrect statement:
1. Biennials are monocarpic plants that normally flower and die in the second season.
2. Wheat, barley and rye are common biennials.
3. After vernalisation, plants have acquired the ability to flower.
4. Even after vernalisation, plants may require additional seasonal cues or weeks of growth before they will actually flower.
Subtopic: Vernalization (OLD NCERT) |
52%
From NCERT
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