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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 |
52%
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Consider the given two statements:
| I: | Differentiation in plants is open. |
| II: | Cells/tissues arising out of the same meristem have different structures at maturity. |
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: Differentiation, Dedifferentiation and Redifferentiation |
57%
From NCERT
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Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
| 1. | Plasticity | 2. | Norm of the reaction |
| 3. | Development noise | 4. | Acclimatisation |
Subtopic: Development |
97%
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Consider the given statements:
| I: | Auxin was first isolated from human urine. |
| II: | They are generally produced by the growing apices of the stems and the roots. |
| III: | IAA and IBA are synthetic auxins. |
| IV: | NAA and 2,4-D have been isolated from plants. |
1. Only I and II are correct
2. Only III and IV are correct
3. I, II and IV are correct
4. I, II, III and IV are correct
Subtopic: Growth Hormones & Auxin |
84%
From NCERT
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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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Auxins:
| I: | promote flowering in pineapples |
| II: | induce parthenocarpy in tomatoes |
| III: | like 2,4-D kill monocot weeds |
| IV: | control xylem differentiation |
1. Only I and II are correct
2. Only III is incorrect
3. I, II, III and IV are correct
4. Only I and IV are incorrect
Subtopic: Growth Hormones & Auxin |
60%
From NCERT
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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: | 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%
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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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