Haemoblobin is a Fe containing protein responsible for oxygen transport in the blood. The curves given below idicate the percentage suturation of haemoglobin by `O_(2)` as a funcion of partial pressure of `O_(2)`.
Which of the following statement/s is/are correct for the given curves?
I. In presence of `CO_(2)`, higher `P_(O_(2))` is needed for a given percentage saturation.
II. In presence of `CO_(2)`, lower `P_(O_(2))` is needed for a give percentage saturation.
III. The maximum percentgae saturation is not affected by the presence of `CO_(2)`
IV. In the absence of `CO_(2)`, maximum saturation of haemoglobin occurs at lower `p_(O_(2))`.
A. Ia nd IV
B. II and IV
C. I,III and IV
D. II and III
