A student estimates that 15 similar cells fit end to end across a distance of 0.60 mm, with no gaps.
The student later finds that only 12 cells fit across this distance.
Which gives the original estimated cell length and its relationship to the revised value?
40 micrometres; larger than the revised value
50 micrometres; smaller than the revised value
40 micrometres; smaller than the revised value
50 micrometres; larger than the revised value
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.