Most widely used compound as a source of ethylene is

$I.$ More female flowers in cucumber
$II.$ $\alpha$-amylase production in barley grain
$III.$ Acceleration of fruit ripening in tomato
$IV.$ Delay in sprouting in potato tubers
From the given effects,identify the effects of ethylene and choose the correct option accordingly.

Recognition of ethylene as a natural plant hormone was done by

What is the influence of ethylene on plants?

What is ethylene gas used for?

The over-ripening of bananas can be delayed by: