Apical dominance in higher plants is due to

After a series of experiments,it was concluded that the ....$A$.... of coleoptile was the site of transmittable influence that caused the bending of the entire coleoptile.

Which of the following hormones does not naturally occur in plants?

Auxins are growth hormones capable of promoting cell elongation. They have been used in horticulture to promote growth,flowering,and rooting. Write a line to explain the meaning of the following terms related to auxins:
$(a)$ Auxin precursors
$(b)$ Antiauxins
$(c)$ Synthetic auxins

Pruning of tea plants is done to discard the effects of

Pruning makes the hedge plant dense because