The table shows information about three organisms.
| Organism | Nucleus | Other evidence |
|---|---|---|
| P | Absent | Chemical analysis places it with archaea |
| Q | Present | Single-celled and has a cell wall |
| R | Present | Multicellular and has no cell walls |
A student groups P with Q because both are microscopic, and puts R in a different domain because it is multicellular.
Which correction is needed?
Group P with Q; separate R because it lacks walls.
Group Q with R; separate P because it lacks nuclei.
Group P with R; separate Q because it has walls.
Group all three; separate none because they contain cells.
40 exam-style questions on AQA GCSE Biology 6.4 Classification of living organisms, covering 6.4 Classification of living organisms. Each one has a worked solution and a mark scheme showing where the marks go.