A light source is placed 0.2 m from a plant. The relative light intensity falling on the plant is 12 units12\text{ units}12 units.
The light source is moved to 0.8 m away.
What is the relative light intensity falling on the plant now?
3.0
1.5
0.75
0.3
117 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.