Recognition of ethylene as a natural plant hormone was done by

Root development is promoted by

The gaseous plant growth regulator is used in plants to :

The shedding of leaves,flowers,or fruits due to a change in the hormonal balance in plants is referred to as:

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?

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

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