Q. No.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
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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 |
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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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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 |
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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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| 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 |
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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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| 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 |
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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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