O-LevelBiologyRespiration5090/21 · Oct/Nov 2021 · Q16 Marks
The diagram shows the human lungs and associated structures.
- (a)Complete the diagram by naming the labelled parts.[3]
- (b)Explain why a human needs lungs.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.
- [1] clockwise from right hand side: trachea / windpipe ;
- [1] bronchiole ;
- [1] larynx / voice box ;
- [1] any three from: gaseous/gas exchange ;
- [1] oxygen in + carbon dioxide out AW ;
- [1] oxygen for respiration / carbon dioxide from respiration ;
- [1] energy from respiration used for movement / relevant activity ;
- [1] needs a large surface area / moist surface / blood capillaries close to air / thin membrane;
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