CAIE A Level Biology 9700 · Classification, biodiversity and conservation
A freshwater pond ecosystem contains various species, including a species of water lily (Nymphaea alba) and a species of dragonfly nymph that lives among the lily pads, preying on small invertebrates. Using this example, explain the terms 'ecosystem' and 'ecological niche'.
5 marks, so the mark scheme is looking for about 5 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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.