The Avena coleoptile test detects the presence of:

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?

Which of the following trace elements is essential for auxin synthesis in plants?

Four coleoptiles are used for an experiment. Which coleoptiles will bend toward the light? Choose the correct option.

Low ratio of cytokinin to auxin induces . . . . . . in plants.

Phototropic curvature is the result of uneven distribution of