Auxins promote

Which of the following movements in plants is not related to a change in auxin level?

Fruit and leaf drop at early stages can be prevented by the application of

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

Which phenomenon describes how apical buds inhibit the growth of lateral buds? How can this be overcome?

Select the correct option for the given figure.