Q. No.Which gaseous PGR is synthesised in large amounts by tissues undergoing senescence and ripening fruits
1.
ABA
2.
IAA
3.
Ethylene
4.
GA
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| 1. | Vertical growth of seedlings |
| 2. | Swelling of axis of dicot seedlings |
| 3. | Apical hook formation in dicot seedlings |
| 4. | Fruit ripening |
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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. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
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| 1. | induce flowering in mango |
| 2. | hasten fruit ripening in tomatoes and apples |
| 3. | retard abscission of flowers and fruits in cotton cherry and walnut |
| 4. | promote female flowers in cucumbers |
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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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| 1. Auxins 2. Cytokinins 3. Gibberellins 4. Ethylene |
 |
| 1. | Auxins | 2. | Cytokinins |
| 3. | Gibberellins | 4. | Ethylene |
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