The least porous soil among the following is a

In which of the following respects do plant hormones differ from enzymes?

One hormone hastens the maturity period in juvenile conifers,a second hormone controls xylem differentiation,while the third increases the tolerance of plants to various stresses. They are respectively:

Which of the following sets is not a natural plant growth regulator?

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

Match the following (Column-$I$ with Column-$II$):

Column-$I$	Column-$II$
$a.$ Weedicide	$(i)$ $GA_3$
$b.$ Bolting	$(ii)$ Cytokinin
$c.$ Thinning of cotton	$(iii)$ Ethylene
$d.$ Lateral shoot growth	$(iv)$ $2, 4-D$