Describe4 marksStandard
The lining of the trachea and bronchi contains goblet cells and ciliated epithelial cells. Describe how these two types of cells work together to protect the gas exchange system from inhaled pathogens and particles.
CAIE A Level Biology 9700 · Gas exchange
Gas exchange: describe question
How this question is marked
4 marks, so the mark scheme is looking for about 4 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.
More Gas exchange questions
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