Which of the following chemicals is used to remove leaves from forest trees?

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. Of what significance is this experiment?

Define/Explain: Auxin.

The primary precursor of $IAA$ is

What happens when auxin is applied to the tip of a cut stump?

Most of the information regarding auxins has been obtained from