The cause of special flavour in onion and garlic is due to the presence of

Match the following scientists with their respective contributions:
$(a)$ Maheshwari $(I)$ Pre-sowing treatment of seeds of $Phaseolus$ $aureus$ with $IAA$
$(b)$ Das $(II)$ $Avena$ curvature test
$(c)$ Went $(III)$ Work on seedless fruit in cucumber
$(d)$ Chakravarty $(IV)$ Successful culture of an ovule of $Papaver$ using $IAA$ and kinetin
Select the correct matching sequence:

The role of ethylene and abscisic acid is both positive and negative. Justify the statement.

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 $B$.

Fill in the blanks:
$(1)$ Maximum growth is observed in ........ phase.
$(2)$ Apical dominance is due to .......

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