What is the full form of $IAA$?

If an etiolated stem is first saturated with auxin by spraying and then exposed to a streak of light from one side,it will:

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.

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.

Which of the following plant hormones prevents the premature falling of fruits?

Which plant hormone prevents pre-mature fruit drop in apple,pear and orange?