Which of the following is not an action of ethylene?
| 1. | Induces leaf abscission |
| 2. | Inhibits root hair growth - decreasing the efficiency of water and mineral absorption |
| 3. | Induces the growth of adventitious roots during flooding |
| 4. | Stimulates epinasty - leaf petiole grows out, leaf hangs down and curls into itself |
The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:
1. Abscisic acid
2. Cytokinin
3. Auxin
4. Ethylene
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
| 1. | vessels and tracheid differentiation |
| 2. | leaf abscission |
| 3. | annual plants |
| 4. | floral parts |
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 |
Which of the following hormones is common in both the categories of plant promoter and plant inhibitor?
1.GA
2.ABA
3.Auxin
4.Ethylene
Which of the following is wrong?
1.ABA is Growth inhibiting regulator
2.Ethylene could fit either of the groups, inhibitors and activators.
3.Auxins, GA and Cytokinins are plant promoters
4.Ethylene is largely a promoter of growth activities
Cousins confirmed the release of a volatile substance from ripened oranges that
| 1. | Hastened the ripening of already ripened bananas |
| 2. | Hastened the ripening of unripened banana |
| 3. | Slowed the ripening of unripened bananas |
| 4. | Slowed the ripening of oranges |
Which of the following hormones is synthesised in large amounts by tissues undergoing senescence and ripening fruits?
(1) Ethylene
(2) ABA
(3) Auxins
(4) GA3
Influences of Ethylene in plants do not include
(1) Horizontal growth of seedlings
(2) Swelling of the axis
(3) Apical hook formation in dicot seedlings
(4) Lateral shoot growth
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