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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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I: | The process, by which exposure to cold renders plants competent to flower is called vernalization. |
II: | Even after vernalization, the plant must be subjected to a suitable photoperiod, usually long days. |
III: | Like photoperiod, vernalization is also perceived in leaves. |
IV: | In most biennial long day plants that form rosettes, gibberellins treatment can substitute for the cold requirement. |
1. | Only I, II and III | 2. | Only I, II and IV |
3. | Only II, III and IV | 4. | I, II, III and IV |
1. Auxins 2. Cytokinins 3. Gibberellins 4. Ethylene |
1. | Auxins | 2. | Cytokinins |
3. | Gibberellins | 4. | Ethylene |
1. | Darwin | 2. | Boysen Jenson |
3. | Paal | 4. | Went |
I: | Auxin stimulates cell elongation by stimulating wall-loosening factors, such as expansins, to loosen cell walls. |
II: | When auxin and cytokinin are applied to callus, rooting can be generated with higher auxin to cytokinin ratios, shoot growth is induced by lower auxin to cytokinin ratios. |
III: | Auxin induces the formation and organization of phloem and xylem. |
IV: | In low concentrations, auxin can inhibit ethylene formation and transport of precursor in plants; however, high concentrations can induce the synthesis of ethylene. |