10 free IB Biology practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
IB Biology Practice Test 14Tutor mode
Question 1 of 10
Form and function
The graph shows oxygen dissociation curves for adult and foetal haemoglobin. In the placenta, the partial pressure of oxygen is about 4 kPa. Which statement explains the importance of the difference between the curves?