Which one of the following pairs is not correctly matched?

Describe the following plant growth regulators:
$(1)$ Gibberellins
$(2)$ Cytokinins

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 $B$.

Chromosome number can be doubled by using which of the following?

List five main groups of natural plant growth regulators. Write a note on discovery,physiological functions and agricultural/horticultural applications of any one of them.

Wound hormone is called