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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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. |
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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. |
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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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I: | is characteristic of living organism growing in a natural environment. |
II: | is typical for all cells, tissues and organs of a plant. |
I: | It is more important for plants than most animals. |
II: | Plants have open growth and development. |
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1. Auxins 2. Cytokinins 3. Gibberellins 4. Ethylene |