CAIE IGCSE Biology 11.1.4 Differences in Composition Between Questions

Practise describing differences in oxygen, carbon dioxide and water vapour between inspired and expired air.

Exam points

state that inspired air contains about 21% oxygen and 0.04% carbon dioxide
state that expired air contains about 16% oxygen and 4% carbon dioxide
state that expired air contains more water vapour than inspired air

[Maximum number: 1]

Which row shows the composition of expired air from a healthy person?

carbon dioxide
\%

oxygen
\%

water vapour

0.04

21

saturated

0.04

16

variable

4

21

variable

4

16

saturated

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