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Q. No.Plasticity in plant growth means that
1. Plant roots are extensible
2. Plant growth is dependent on the environment
3. Stems can extend
4. None of the above
1. Plant roots are extensible
2. Plant growth is dependent on the environment
3. Stems can extend
4. None of the above
Subtopic: Growth Terminology | Development |
88%
From NCERT
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To promote stem elongation, gibberellins act in concert with:
| 1. | Auxins | 2. | Cytokinins |
| 3. | Ethylene | 4. | ABA |
Subtopic: Growth Hormones & Auxin | Auxin Function | Gibberellin |
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The removal or inactivation of which of the following will lead to germination of many types of dormant seeds?
| 1. | ABA | 2. | Ethylene |
| 3. | Cytokinins | 4. | Gibberellins |
Subtopic: Abscisic Acid |
76%
From NCERT
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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. |
Subtopic: Growth Hormones & Auxin |
81%
From NCERT
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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 |
Subtopic: Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
92%
From NCERT
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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%
From NCERT
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Formation of interfascicular cambium and cork cambium is possible most importantly because of:
| 1. | Differentiation | 2. | Dedifferentiation |
| 3. | Redifferentiation | 4. | Reverse differentiation |
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
83%
From NCERT
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All the following contribute to an increase in girth of dicots and gymnosperms except:
| 1. | Apical meristem | 2. | Lateral meristems |
| 3. | Vascular cambium | 4. | Cork-cambium |
Subtopic: Growth | Growth Model | Growth Terminology |
81%
From NCERT
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Match each item in Column I with the one in Column II and select the correct match from the codes given:
Codes:
| COLUMN I [PGR] |
COLUMN II [Discovered by] |
||
| A | Auxin | P | F. W. Went |
| B | Gibberellic acid | Q | E. Kurosawa |
| C | Kinetin | R | Miller et al. |
| D | Ethylene | S | H. H, Cousins |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | S | R |
| 3. | R | S | Q | P |
| 4. | S | R | P | Q |
Subtopic: Growth Hormones & Auxin |
91%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Growth, at a cellular level, is measured by a variety of parameters such as increase in fresh weight, dry weight, length, area, volume and cell number. |
| Reason (R): | Such parameters are more or less proportional to the increase in protoplasm which is primarily responsible for growth at cellular level. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Growth |
83%
From NCERT
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