Which plant growth regulators are required to obtain callus?

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	$(iv)$ $2, 4-D$

Match the following:

Column $I$	Column $II$
$a.$ Auxin	$(i)$ Root hair formation
$b.$ Cytokinin	$(ii)$ Seed development
$c.$ Ethylene	$(iii)$ Xylem differentiation
$d.$ $ABA$	$(iv)$ Nutrient mobilisation

Distinguish between:
$(1)$ Cell enlargement and Cell differentiation
$(2)$ Epigeal germination and Hypogeal germination

Match the following:
Column-$A$ | Column-$B$
$(1)$ Auxin | $(I)$ Ripening and maturity of fruits
$(2)$ Gibberellin | $(II)$ Differentiation of xylem elements
$(3)$ Cytokinin | $(III)$ Prevention of genetic and physiological dwarfism
$(4)$ Ethylene | $(IV)$ Found from tumour tissue of tobacco

The movement in the leaf lobes of $Dionaea$ (Venus flytrap) is due to: