During an investigation into the rate of photosynthesis in Elodea canadensis, a student positions an LED light source at a distance of 0.60 m from the pondweed. The relative light intensity falling on the plant is measured as 15 units15\text{ units}15 units.
The student then moves the light source closer to the plant, positioning it at a distance of 0.15 m.
What is the relative light intensity falling on the plant at this new distance?
3.75 units3.75\text{ units}3.75 units
60.0 units60.0\text{ units}60.0 units
0.94 units0.94\text{ units}0.94 units
240.0 units240.0\text{ units}240.0 units
12 exam-style questions on OCR GCSE Biology 1.4 Photosynthesis, covering 1.4.1 Photosynthesisers as biomass producers, 1.4.2 Factors affecting the rate of photosynthesis, and 1.4.3 Limiting factors in photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.