CAIE A Level Biology 9700 · Biological molecules
The table below lists two properties of water and a biological role that depends on each property.
| Property of water | Biological role |
|---|---|
| High specific heat capacity | Helps aquatic organisms maintain a constant internal body temperature |
| Good solvent for polar substances | Allows transport of nutrients and waste products in the blood |
Explain how each property of water is a consequence of hydrogen bonding between water molecules and how it supports the biological role stated.
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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