To extend their market period, fruits can be left on trees longer by the application of:
1. | Auxin | 2. | Gibberellins |
3. | Cytokinin | 4. | ABA |
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 |
The site of perception of light/dark duration in plants is:
1. Root apex
2. Shoot apex
3. Flower
4. Leaves
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 |