Flowering in pineapple is promoted by

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

Avena curvature test is a bioassay for examining the activity of

The bioassay for auxin is:

In most of the higher plants,the growing $A$ bud inhibits the growth of $B$ bud,a phenomenon called apical dominance. Removal of the shoot tips usually results in growth of $C$ buds.

Apical dominance is caused by which of the following?