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 |
Subtopic: Growth Hormones & Auxin |
70%
Level 2: 60%+
Hints
Auxin was first isolated from:
| 1. | Coconut milk | 2. | Barley endosperm |
| 3. | Oat coleoptiles | 4. | Human urine |
Subtopic: Growth Hormones & Auxin |
77%
Level 2: 60%+
Hints
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 |
Subtopic: Growth Hormones & Auxin |
79%
Level 2: 60%+
Hints
Cytokinins do not help in:
| 1. | Production of new leaves |
| 2. | Lateral shoot growth |
| 3. | Adventitious shoot formation |
| 4. | Promotion of apical dominance |
Subtopic: Growth Hormones & Auxin | Cytokinin |
80%
Level 1: 80%+
Hints
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 |
Subtopic: Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
91%
Level 1: 80%+
Hints
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. |
Subtopic: Growth Hormones & Auxin |
81%
Level 1: 80%+
Hints
To promote stem elongation, gibberellins act in concert with:
| 1. | Auxins | 2. | Cytokinins |
| 3. | Ethylene | 4. | ABA |
Subtopic: Growth Hormones & Auxin | Auxin Function | Gibberellin |
50%
Level 3: 35%-60%
Hints
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 |
Subtopic: Growth Hormones & Auxin |
85%
Level 1: 80%+
Hints
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 |
Subtopic: Growth Hormones & Auxin |
89%
Level 1: 80%+
Hints
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 |
Subtopic: Growth Hormones & Auxin |
60%
Level 2: 60%+
Hints
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