Q. No.Identify the incorrect statement:
1. Biennials are monocarpic plants that normally flower and die in the second season.
2. Wheat, barley and rye are common biennials.
3. After vernalisation, plants have acquired the ability to flower.
4. Even after vernalisation, plants may require additional seasonal cues or weeks of growth before they will actually flower.
1. Biennials are monocarpic plants that normally flower and die in the second season.
2. Wheat, barley and rye are common biennials.
3. After vernalisation, plants have acquired the ability to flower.
4. Even after vernalisation, plants may require additional seasonal cues or weeks of growth before they will actually flower.
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True seed dormancy:
1. is caused by conditions within the seed that prevent germination under normally ideal conditions.
2. is caused by unfavourable environmental conditions.
3. is seen in all seeds.
4. does not have any evolutionary significance.
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| 1. Abscisic acid | 2. Phenolic acids |
| 3. Para-ascorbic acid | 4. Gibberellic acid |
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1. Mechanical abrasions or vigorous shaking
2. Microbial action
3. Subjecting seeds to chilling conditions
4. Treating seeds with abscisic acid or para-ascorbic acid
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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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| 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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| 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 |
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