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 |
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. |
I: | The PGR is ABA. |
II: | Chemically, it is a terpene. |
III: | Seed germination is inhibited by it in antagonism with gibberellin. |
IV: | It is also produced in the roots in response to decreased soil water potential. |
1. | Only I, II and III | 2. | Only I, II and IV |
3. | Only I, III and IV | 4. | Only II, III and IV |
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Consider the given diagram regarding seed germination and identify the correct statements from the statements given:
I: | ’A’ shows epigeal germination and ‘B’ shows hypogeal germination. |
II: | In hypogeal germination, seeds are much less vulnerable to grazing. |
III: | Plants showing hypogeal germination are more commonly found in nutrient-poor soils. |
IV: | Plants showing epigeal germination produce a large number of seeds. |
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
1. | When the apical bud is removed, the lowered IAA concentration allows the lateral buds to grow and produce new shoots, which compete to become the lead growth. |
2. | When the apical bud is removed, the increased IAA concentration allows the lateral buds to grow and produce new shoots, which compete to become the lead growth. |
3. | When the apical bud is removed, the lowered IAA concentration stops the growth of lateral buds and production of new shoots. |
4. | When the apical bud is removed, the increased IAA concentration stops the growth of lateral buds and production of new shoots. |
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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