CAIE A Level Biology 9700 · Cell structure
A student prepared a temporary mount of onion epidermal cells and observed them using a light microscope with a resolution of 200 nm. The same cell type was also observed using a transmission electron microscope (TEM) with a resolution of 0.2 nm.
Explain the difference in resolution between the two microscopes and how this affects the level of detail that can be seen in cell structures.
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.
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