Q. No.Callus from internodal segments of tobacco stem gets proliferated only if in addition to one of the following – extracts of vascular tissues, yeast extract, coconut milk or DNA, the nutrient medium also contains:
| 1. Auxins | 2. Gibberellins |
| 3. ABA | 4. Ethylene |
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Auxin was first isolated from:
| 1. Coconut milk | 2. Barley endosperm |
| 3. Oat coleoptiles | 4. Human urine |
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Auxin does not:
1. Help to initiate rooting in stem cuttings
2. Promote female flowers in cucumbers
3. Prevent fruit and leaf drop in early stages
4. Promote abscission of older mature leaves and fruits
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Cytokinins do not help in:
1. Production of new leaves
2. Lateral shoot growth
3. Adventitious shoot formation
4. Promotion of apical dominance
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Match the following :
| A. IAA | i. Herring sperm DNA |
| B. ABA | ii. Bolting |
| C. Ethylene | iii. Stomatal closure |
| D. GA | iv. Weed-free lawns |
| E. Cytokinins | v. Ripening of fruits |
Options:
| A | B | C | D | E | |
| 1. | iv | iii | v | ii | i |
| 2. | v | iii | iv | ii | i |
| 3. | iv | i | v | iii | ii |
| 4. | v | iii | ii | i | iv |
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The term synergistic action of hormones refers to
1. When two hormones act together but bring about opposite effects.
2. When two hormone act together and contribute to the same function.
3. When one hormone affects more than one function.
4. When many hormones bring about any one function.
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To promote stem elongation, gibberellins act in concert with:
| 1. Auxins | 2. Cytokinins |
| 3. Ethylene | 4. ABA |
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Consider the given statements:
I. Auxin was first isolated from human urine.
II. They are generally produced by the growing apices of the stems and the roots.
III. IAA and IBA are synthetic auxins.
IV. NAA and 2,4-D have been isolated from plants.
1. Only I and II are correct
2. Only III and IV are correct
3. I, II and IV are correct
4. I, II, III and IV are correct
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Consider the given two statements:
I: Removal of shoot tips is widely applied in hedge making and tea plantations.
II: Removal of shoot tips usually results in the growth of lateral buds.
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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Auxins:
| I: | promote flowering in pineapples |
| II: | induce parthenocarpy in tomatoes |
| III: | like 2,4-D kill monocot weeds |
| IV: | control xylem differentiation |
1. Only I and II are correct
2. Only III is incorrect
3. I, II, III and IV are correct
4. Only I and IV are incorrect
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