When temperature decreases oxyhaemoglobin curve will become
a)	More steep	b)	Straight	c)	Parabola	d)	All of these

(a)

The oxygen haemoglobin dissociation curve is sigmoid, which represents the relationship between oxygen concentration and percentage saturation of haemoglobin. The rise in temperature or fall in pH shifts the curve to the right, while at decreased temperature and rise in pH, the curve becomes more steep.