The gaseous plant hormone is . . . . . . .

Which one of the following responses of plants to growth hormones is true for ethylene?

The ripening of fruits can be fastened by treatment with

Identify the correct option for $A$ and $B$.

Compound	Function
$2,4-D$	$A$
$B$	Fruit ripening

Production of cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants?

Which group of gases is favorable for fruit ripening?