Two plant species are grown for the same time. Each pot starts with either 20 plants of one species or 10 plants of each species. Pots contain the same amount of soil and receive the same water and light.
The table shows the total dry mass of each species per pot.
| Planting arrangement | Dry mass of P / g | Dry mass of Q / g |
|---|---|---|
| P only | 80 | 0 |
| Q only | 0 | 60 |
| P and Q together | 50 | 15 |
Which conclusion follows when mean mass per plant is compared?
P grows better with Q than with P; Q grows worse with P than with Q.
P grows worse with Q than with P; Q grows better with P than with Q.
Both species grow better with the other species than with their own species.
Both species grow worse with the other species than with their own species.
40 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.