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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
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
57%
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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 |
Subtopic: Growth Hormones & Auxin |
90%
From NCERT
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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 |
91%
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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 |
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 |
Subtopic: Ethylene |
79%
From NCERT
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Consider the given two statements:
| 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 |
85%
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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 |
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
90%
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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 |
From NCERT
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