A laboratory tests four antiseptics intended for cleaning grazed skin. Four identical agar plates are covered with equal volumes of the same bacterial culture. One paper disc soaked in antiseptic J, K, L or M is placed on each plate.
The table shows the area of the inhibition zone on each plate after incubation.
| Antiseptic | Area of inhibition zone in mm² |
|---|---|
| J | 78 |
| K | 154 |
| L | 201 |
| M | 113 |
Which antiseptic would leave the greatest area of bacterial growth on its plate?
The plate tested with antiseptic L
The plate tested with antiseptic M
The plate tested with antiseptic J
The plate tested with antiseptic K
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.