A nursery measured water absorption in three groups of seedlings grown in identical conditions. Each group contained 20 seedlings. The mean thickness of the root hair cell walls differed between groups.
| Group | Mean thickness of root hair cell walls in micrometres | Mean water absorption rate per seedling in cm³ per day |
|---|---|---|
| A | 0.20 | 2.8 |
| B | 0.40 | 2.2 |
| C | 0.60 | 1.6 |
Explain how the results support the idea that a thin cell wall helps a root hair cell absorb water.
A group of 20 seedlings has a mean root hair cell wall thickness of 0.50 micrometres. Predict the total volume of water this group will absorb in 5 days.
Show your working.
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.