A plant grows near three disused quarry sites. Its seeds are carried between sites in the fur of grazing animals.
Soil moisture, soil pH and mineral ion content are suitable and similar at all three sites.
Scientists recorded the light intensity, the number of seeds arriving and the number of seedlings still alive after eight weeks.
| Site | Light intensity as a percentage of full daylight | Seeds arriving | Seedlings still alive after eight weeks |
|---|---|---|---|
| R | 75 | 20 | 10 |
| S | 20 | 100 | 10 |
| T | 75 | 100 | 50 |
Two interventions are available:
Each intervention can be used at only one of sites R and S.
Calculate the percentage of arriving seeds that produced seedlings still alive after eight weeks at each site.
Explain which intervention should be used at site R and which should be used at site S.
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.