Q. No.Select the correct statements based on the information shown below in the diagrammatic representation of location of root apical meristem, shoot apical meristem and vascular cambium where the arrows exhibit the direction of growth of cells and organs:
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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I: is characteristic of living organism growing in a natural environment.
II: is typical for all cells, tissues and organs of a plant.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I: It is more important for plants than most animals.
II. Plants have open growth and development.
1. Both I and II are true and II explains I.
2. Both I and II are true but II does not explain I.
3. I is correct and II is incorrect.
4. I is incorrect and II is correct.
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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.
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
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
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