Root development is promoted by

Which hormone induces fruit ripening?

Which hormone is produced mostly in all parts of a plant?

Which of the following is used to artificially ripen banana fruits?

Which group of gases is favorable for fruit ripening?

$I.$ 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.