Which of the following statements about plant hormones is false?
| 1. | The growth of plants in nature is probably regulated by a combination of growth-stimulating and growth-inhibiting hormones. |
| 2. | Abscisic acid generally promotes growth. |
| 3. | Gibberellins stimulate cell enlargement. |
| 4. | Cytokinins promote cell division. |
During seed germination its stored food is mobilised by.
1. ethylene
2. cytokinin
3. ABA
4. gibberellin
Which one of the following pairs, is not correctly matched?
1. Abscisic acid - Stomatal closure
2. Gibberellic acid - Leaf fall
3. Cytokinin - Cell division
4. IAA - Cell wall elongation
Gibberellins can promote seed germination because of their influence on
| 1. | rate of cell division |
| 2. | production of hydrolyzing enzymes |
| 3. | synthesis of abscisic acid |
| 4. | absorption of water through hard seed coat |
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses.They are respectively:-
| 1. | Gibberellin, Auxin, Ethylene |
| 2. | Auxin, Gibberellin, Cytokinin |
| 3. | Gibberellin, Auxin, ABA |
| 4. | Auxin, Gibberellin, ABA |
Which of the following plant growth hormone increase the yield of sugar by increasing the length of stem in sugarcane?
| 1. | Cytokinin | 2. | Ethylene |
| 3. | Gibberellic acid | 4. | Auxin |
Match each item in Column I with one item in Column II and chose your answer from the codes given below:
| Column I | Column II | ||
| I. | Malting in brewing | 1. | Cytokinins |
| II. | Parthenocarpy in tomatoes | 2. | Gibberellins |
| III. | Overcoming apical dominance | 3. | Ethylene |
| IV. | Female flowers in Cucumbers | 4. | Auxins |
Codes:
| I | II | III | IV | |
| A. | 4 | 2 | 3 | 41 |
| B. | 2 | 1 | 4 | 3 |
| C. | 2 | 4 | 1 | 3 |
| D. | 4 | 2 | 1 | 3 |
The PGRs of the other group which play an important role in plant growth inhibiting activities is not
1.Ethylene
2.ABA
3.GA
4.All of these
© 2026 GoodEd Technologies Pvt. Ltd.