Ethylene

The gaseous plant growth regulator is used in plants to:

1.	kill dicotyledonous weeds in the fields
2.	speed up the malting process
3.	promote root growth and root hair formation to increase the absorption surface
4.	help overcome apical dominance

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 plants?

1.	Cytokinin	2.	ABA
3.	Gibberellin	4.	Ethylene

Which hormone promotes internode / petiole elongation in deep water rice?

1.	2, 4-D	2.	GA3
3.	Kinetin	4.	Ethylene