Q. No.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
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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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| 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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| Statement I: | The root apical meristem and the shoot apical meristem are responsible for the primary growth of the plants and principally contribute to the elongation of the plants along their axis. |
| Statement II: | In dicots and gymnosperms, the lateral meristems, vascular cambium and cork-cambium appear later in life and cause the increase in the girth of the organs in which they are active. |
1. Both Statement I and Statement II
2. Only Statement I
3. Only Statement II
4. Neither Statement I nor Statement II
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| I: | The region shown as A to G is the zone of elongation. |
| II: | The portion of the axis which is undergoing the phase of maturation lies more distal to the phase of elongation. |
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
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