Which type of phytohormone is made up of indole compounds?

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?

Plants with zinc deficiency show reduced biosynthesis of $..........$

Phototropic curvature is the result of an uneven distribution of which of the following?

Which of the following hormones is a weak organic acid having unsaturated ring structures and is derived from an amino acid?

Observe the following structure. The above structure is of an auxin,which is: