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.
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| 1. | ABA | 2. | IAA |
| 3. | Ethylene | 4. | GA |
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| 1. | Vertical growth of seedlings |
| 2. | Swelling of axis of dicot seedlings |
| 3. | Apical hook formation in dicot seedlings |
| 4. | Fruit ripening |
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| 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 |
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| 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 |
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1. Pseudo-Dormancy
2. Thermonasty
3. Vernalisation
4. Scarification
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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 |
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True seed dormancy:
1. is caused by conditions within the seed that prevent germination under normally ideal conditions.
2. is caused by unfavourable environmental conditions.
3. is seen in all seeds.
4. does not have any evolutionary significance.
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| 1. Abscisic acid | 2. Phenolic acids |
| 3. Para-ascorbic acid | 4. Gibberellic acid |
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1. Mechanical abrasions or vigorous shaking
2. Microbial action
3. Subjecting seeds to chilling conditions
4. Treating seeds with abscisic acid or para-ascorbic acid
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