Auxins are

$I.$ Cell elongation
$II.$ Cell division
$III.$ Cell differentiation
Among the above mentioned,what is/are the function$(s)$ of auxin?

Provide the full names of the following plant growth regulators:
$(1)$ $NAA$
$(2)$ $IPA$

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 botanical gardens and tea gardens,gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation?

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