A researcher prints micrographs of four single-celled organisms found in pond water. Each micrograph is printed at ×500\times 500×500.
The researcher measures the length of each image.
| Micrograph | Length of image |
|---|---|
| P | 1.5 mm |
| Q | 15 mm |
| R | 30 mm |
| S | 150 mm |
Which micrograph shows an organism with an actual length of 30 μm30\ \mu\text{m}30 μm?
Micrograph P
Micrograph R
Micrograph Q
Micrograph S
130 exam-style questions on OCR GCSE Biology 1.1 Cell structures, covering 1.1.1 Viewing cells with light microscopes, 1.1.2 Sub-cellular structures and functions, and 1.1.3 Electron microscopy and resolution. Each one has a worked solution and a mark scheme showing where the marks go.