CAIE A Level Biology 9700 · Cell structure
A student used a light microscope to observe onion epidermal cells. She drew one cell and measured its length in the drawing as 60 mm. The actual length of the cell is 0.2 mm.
(a) Define the term magnification. (b) Define the term resolution. (c) Explain why the resolution of a light microscope is lower than that of an electron microscope.
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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