The plant hormone used to destroy weeds in a field is:
1. 2, 4-D
2. IBA
3. IAA
4. NAA

It takes 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

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 growth of lateral buds is enhanced.

4. Gibberellins delay senescence of leaves.

Fruit and leaf drop at early stages can be prevented by the application of:

1. Ethylene

2. Auxins

3. Gibberellic acid

4. Cytokinins

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1.  IAA and gibberellin

2.  Auxin and cytokinin

3.  Auxin and abscisic acid

4.  Gibberellin & abscisic acid

One of the synthetic auxin is

1. NAA

2. IAA

3. GA

4. IBA

If the apical bud has been removed then we observe :

1. More lateral branches

2. More axillary buds

3. Plant growth stops

4. Flowering stops