Q. No.Kinetin was first discovered from:
1.
Herring sperm DNA
2.
Coconut milk
3.
Yeast extract
4.
Corn kernels
Cytokinins do not help in:
| 1. | Production of new leaves |
| 2. | Lateral shoot growth |
| 3. | Adventitious shoot formation |
| 4. | Promotion of apical dominance |
Cytokinins help in delay of leaf senescence because they:
| 1. | Promote new leaves formation |
| 2. | Help overcome apical dominance |
| 3. | Help in chloroplast formation in leaves |
| 4. | Promote nutrient mobilization |
Normally, when the seeds are mature, ethylene production increases and builds-up within the fruit, resulting in a climactic event that means:
| 1. | A sudden spurt of growth | 2. | Leaf expansion |
| 3. | Rise in respiratory rate | 4. | Death of radicle |
Which PGR is used to initiate flowering and for synchronizing fruit set in pineapple?
| 1. | Cytokinin | 2. | ABA |
| 3. | Ethylene | 4. | GA |
Which PGR stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stress?
| 1. | Cytokinin | 2. | Giberrellin |
| 3. | ABA | 4. | Ethylene |
In most situations, which PGR acts as an antagonist to GAs?
| 1. | ABA | 2. | Ethylene |
| 3. | Cytokinin | 4. | Giberrellin |
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 |
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. |
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
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