In which of the following respects do plant hormones differ from enzymes?

Which one of the following hormones is not found in plants?

Match the following concerning the activity function and the phytohormone involved.

Column $I$	Column $II$
$(a)$ Fruit ripener	$(i)$ Abscisic acid
$(b)$ Herbicide	$(ii)$ $2,4-D$
$(c)$ Bolting agent	$(iii)$ $GA_{3}$
$(d)$ Stress hormone	$(iv)$ Ethephon

Select the correct option from the following:

It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

One hormone hastens the maturity period in juvenile conifers,a second hormone controls xylem differentiation,while the third increases the tolerance of plants to various stresses. They are respectively:

Which of the following exhibits a non-polar movement?