CAIE A Level Biology 9700 · Cell structure
A student observes a plant cell using a light microscope. The actual length of the cell is 50 μm. The student draws the cell with a length of 80 mm on paper.
(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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.