Four samples of dead seaweed with equal dry masses were placed in separate mesh containers, each kept at a different temperature, for 10 days. The table shows the dry mass readings for each sample.
| Sample | Initial dry mass in g | Final dry mass in g |
|---|---|---|
| P | 64.0 | 46.0 |
| Q | 64.0 | 62.2 |
| R | 64.0 | 54.0 |
| S | 64.0 | 52.2 |
Which sample had a mean rate of dry mass loss of 1.8 g day−11.8\,\text{g day}^{-1}1.8g day−1?
sample S
sample P
sample Q
sample R
101 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.