Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:
1. | Gibberellins prevent bolting and are inactivated. |
2. | Auxins prevent leaf drop at early stages. |
3. | Effect of auxins is removed and the growth of lateral buds is enhanced. |
4. | Gibberellins delay the senescence of leaves. |
In order to increase the yield of sugarcane crops, which of the following plant growth regulators should be sprayed?
1. | Ethylene | 2. | Auxins |
3. | Gibberellins | 4. | Cytokinins |
What is the site of perception of photoperiod necessary for induction of flowering in plants?
1. Leaves
2. Lateral buds
3. Pulvinus
4. Shoot apex
It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
1. Cytokinin and Abscisic acid
2. Auxin and Ethylene
3. Gibberellin and Cytokinin
4. Gibberellin and Abscisic acid
Which one of the following pairs is not correctly matched?
1. | Abscisic acid - Stomatal closure |
2. | Gibberellic acid - Leaves fall |
3. | Cytokinin - Cell division |
4. | IAA - Cell wall elongation |
"Foolish seedling" disease of rice led to the discovery of:
1. GA
2. ABA
3. 2, 4-D
4. IAA
Which one of the following acids is a derivative of carotenoids?
1. Indole-butyric acid
2. Indole-3-acetic acid
3. Gibberellic acid
4. Abscisic acid
One of the synthetic auxin is:
1. NAA
2. IAA
3. GA
4. IBA
Which one of the following growth regulators is known as the stress hormone?
1. Abscisic acid
2. Ethylene
3. GA3
4. Indole acetic acid
The typical growth curve in plants is: