Skip to content

Course home

Sign up

1.2 Number, size and scale

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536
Question 17
F

A student needs to estimate the number of bacterial cells in a large, well-mixed sample. Counting every cell would take several days.

Which method and reason are most appropriate?

[1]
A

Count several known small volumes and use their maximum; this allows variation between samples to be considered.

B

Count several known small volumes and use their mean; this allows variation between samples to be considered.

C

Count one known small volume and use its count; this ensures every cell in the sample is counted.

D

Count one known small volume and use its count; this ensures variation between samples has been removed.

Markscheme

1.2 Number, size and scale Questions

  1. GCSE
  2. /Biology
  3. /1.2 Number, size and scale

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.

Question bank