A conservation team is trying to establish a freshwater shrimp population in each of two restored river channels. Both channels have suitable temperature, food and shelter.
The table shows results from one week.
| Channel | Dissolved oxygen concentration in mg/dm³ | Shrimp entering the channel | Shrimp remaining alive at the end of the week |
|---|---|---|---|
| T | 2.0 | 76 | 4 |
| U | 7.2 | 5 | 4 |
A team member claims that dissolved oxygen concentration is limiting the number of shrimp remaining alive in both channels.
Which evaluation of this claim is best supported by the data?
It fits neither channel, because more shrimp entering channel T means more competition for food.
It fits channel T only, because most of the shrimp that entered channel U survived.
It fits channel T only, but adding oxygen would also increase the shrimp alive in channel U.
It fits both channels, because the same number of shrimp remained alive in each channel.
82 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.