1. | They were discovered as kinetin, a modified form of adenine. |
2. | Zeatin was isolated from corn-kernels and coconut milk. |
3. | Kinetin occurs widely in almost all plants. |
4. | Natural cytokinins are synthesized in region where rapid cell division occurs. |
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I: | Help produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious root formation. |
II: | Help overcome the apical dominance. |
III: | Promote nutrient mobilisation, which helps in the delay of leaf senescence. |
1. Only I and II | 2. Only I and III |
3. Only II and III | 4. I, II and III |
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1. | ABA | 2. | IAA |
3. | Ethylene | 4. | GA |
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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. |
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I: | Vernalisation enables the plant to have sufficient time to reach maturity. |
II: | It prevents precocious reproductive development late in the growing season. |
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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Consider the given two statements:
I: | Winter varieties of wheat are planted in autumn. |
II: | Spring varieties of wheat are planted in winters. |
1. | Both I and II are correct |
2. | Both I and II are incorrect |
3. | I is correct but II is incorrect |
4. | I is incorrect but II is correct |
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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.
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