The plant hormone used to destroy weeds in a field is:

1.	2, 4-D	2.	IBA
3.	IAA	4.	NAA

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:

The site of perception of light in plants during photoperiodism is:

1. Axillary bud

2. Leaf

3. Shoot apex

4. Stem

Coconut milk factor is:
1. An auxin
2. A gibberellin
3. Abscisic acid
4. Cytokinin

Seed dormancy is due to:

Which of the following PGR is present in coconut milk which is used in tissue culture?

1. Cytokinin

2. Auxin

3. Gibberellin

4. Ethylene

Which hormone is responsible for fruit ripening:

1. Ethylene

2. Auxin

3. Ethyl chloride

4. Cytokinin

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

Cell elongation in internodal regions of the green plants takes place due to:

The maximum growth rate occurs in:

1. Senescent phase

2. Lag phase

3. Exponential phase

4. Stationary phase