Wound hormone is called

Which of the following are added as growth promoters in culture media?
$(i)$ Ethylene
$(ii)$ Abscisic acid
$(iii)$ Gibberellin
$(iv)$ Auxin
$(v)$ Cytokinin

$I.$ Kinetin is a degradative substance from $DNA$.
$II.$ $ABA$ is present in all plants including lower plants.
$III.$ Low ratio of cytokinin to auxin favours root formation only.
$IV.$ $ABA$ is synthesized catabolically through glycolysis pathway.
Choose the correct combination of options.

The abscission layer is covered by a leaf scar which is composed of

Match the following columns:

Column-$I$	Column-$II$
$A$. Plant growth promoters	$1$. Auxin
$B$. Plant growth inhibitor	$2$. Gibberellin
	$3$. Abscisic acid
	$4$. Cytokinin

Select the correct matching for $A$ and $B$.

$A$ clinostat is an instrument used in experiments related to: