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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
Subtopic: Ethylene |
94%
From NCERT
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Which of the following is not a function of the PGR ethylene?
| 1. | Vertical growth of seedlings |
| 2. | Swelling of axis of dicot seedlings |
| 3. | Apical hook formation in dicot seedlings |
| 4. | Fruit ripening |
Subtopic: Ethylene |
79%
From NCERT
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Consider the given two statements:
| 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 |
Subtopic: Ethylene |
85%
From NCERT
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Ethylene does not:
| 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 |
Subtopic: Ethylene |
75%
From NCERT
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In certain plants, flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This phenomenon is termed:
1. Pseudo-Dormancy
2. Thermonasty
3. Vernalisation
4. Scarification
1. Pseudo-Dormancy
2. Thermonasty
3. Vernalisation
4. Scarification
90%
From NCERT
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Consider the given two statements:
| 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 |
77%
From NCERT
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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.
51%
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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.
61%
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Chemical inhibitors present in dormant seeds may include all the following except:
| 1. Abscisic acid | 2. Phenolic acids |
| 3. Para-ascorbic acid | 4. Gibberellic acid |
82%
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