Auxin can be bioassayed by?

1. Avena coleoptiles curvature

2. Hydroponics

3. Ptometer

4. Lettuce hypocotyl elongation

What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?

Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly - cut coleoptile stumps. What is the significance of this experiment?
 

Phototropic curvature is the result of uneven distribution of:

1. gibberellin

2. phytochrome

3. cytokinins

4. auxin

One of the commonly used plant growth hormone in tea plantations is:

Root development is promoted by:
1. Auxin
2. Gibberellin
3. Ethylene
4. Abscisic acid

One of the synthetic auxin is:

1. NAA

2. IAA

3. GA

4. IBA