Light intensity is inversely proportional to the square of the distance from a lamp. light intensity∝1distance2\text{light intensity} \propto \dfrac{1}{\text{distance}^2}light intensity∝distance21 A student moves a lamp from 10 cm to 20 cm away from some pondweed. What happens to the light intensity at the pondweed?
It doubles.
It halves.
It becomes four times greater.
It falls to one quarter.
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.