Scientists grew equal numbers of similar-sized bean seedlings for four weeks under each set of conditions shown. The temperature and carbon dioxide concentration were kept the same for all groups.
| Light intensity / lux | Soil moisture / % | Mean dry mass / g |
|---|---|---|
| 16 000 | 22 | 5.1 |
| 4 000 | 8 | 1.4 |
| 4 000 | 22 | 4.5 |
Which conclusion about the effects of light intensity and soil moisture is supported by the results?
Lower soil moisture and lower light intensity reduce dry mass by similar amounts.
Lower light intensity reduces dry mass much more than lower soil moisture.
Lower soil moisture reduces dry mass much more than lower light intensity.
Lower soil moisture increases dry mass, whereas lower light intensity reduces dry mass.
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.