Groups of similar young bean plants were kept for four hours at different relative humidities. All other environmental conditions were the same.
The roots of each plant were in a container of dilute mineral ion solution. Each container was sealed around the stem to prevent water evaporating directly from the solution.
The table shows the mean results.
| Relative humidity in % | Mass of water absorbed by the roots in g | Mass of water vapour lost from the leaves in g |
|---|---|---|
| 30 | 8.2 | 7.8 |
| 50 | 6.1 | 5.7 |
| 70 | 4.0 | 3.6 |
Use the results to explain the relationship between the mass of water vapour lost from the leaves and the mass of water absorbed by the roots.
Suggest values for both measurements at a relative humidity of 90% if the pattern in the results continues. Explain your suggestion.
74 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.