CAIE A Level Biology 9700 · Biological molecules
Table 1 shows two properties of water and their roles in the body of a mammal.
| Property of water | Role in the body |
|---|---|
| High specific heat capacity | Buffers temperature fluctuations to maintain a stable internal environment |
| High latent heat of vaporisation | Cooling the body through evaporation of sweat |
Explain how the hydrogen bonding between water molecules is responsible for each property and how each property enables the stated role.
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.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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