CAIE A Level Biology 9700 · Transport in mammals
A mountaineer stays at an altitude of 5000 m for several weeks. At high altitude, the partial pressure of oxygen in the atmosphere is very low. Describe how the transport of oxygen and carbon dioxide by the blood is adapted to the low oxygen conditions.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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