Q. No.In plants, the living differentiated cells, have lost the capacity of division under certain conditions. This phenomenon is termed as:
1. Dedifferentiation
2. Proto-differentiation
3. Redifferentiation
4. Secondary differentiation
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Consider the given two statements:
I: Removal of shoot tips is widely applied in hedge making and tea plantations.
II: Removal of shoot tips usually results in the growth of lateral buds.
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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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
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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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