The least porous soil among the following is a

Read the following statements regarding $\text{PGRs}$:
$A.$ Ethylene also promotes root growth and root hair formation.
$B.$ Natural cytokinins are synthesized in regions where rapid cell division occurs.
$C.$ $2,4-D$,widely used to kill monocotyledonous weeds,does not affect mature dicotyledonous plants.

The movement of leaves in $Mimosa$ $pudica$ is due to:

Which one of the following pairs of plant hormones inhibits flowering in some plants?

What causes the movement of leaves in the $Mimosa$ $pudica$ plant?

Plant growth substances $(PGS)$ have innumerable practical applications. Name the $PGS$ you should use to:
$(a)$ Increase yield of sugarcane.
$(b)$ Promote lateral shoot growth.
$(c)$ Cause sprouting of potato tuber.
$(d)$ Inhibit seed germination.