Pruning of tea plants is done to discard the effects of

The pineapple,which under natural conditions is difficult to blossom,has been made to produce fruits throughout the year by the application of:

What is the direction of transport of auxin?

After a series of experiments,it was concluded that the ...$A$... of coleoptile was the site of transmittable influence that caused the ...$B$... of the entire coleoptile. Complete the given statement with the correct combination of options given in the codes below.

Provide the full names for the following abbreviations:
$(1)$ $PGRs$
$(2)$ $IAA$

Auxin was isolated by ................ from tips of coleoptile of ....