A tray of lettuce seedlings is grown under a lamp. The tray is moved from 12 cm to 30 cm from the lamp. The lamp is not changed. Light intensity is inversely proportional to the square of the distance from the lamp.
How does the light intensity at 30 cm compare with the light intensity at 12 cm?
It is 6.256.256.25 times as great.
It is 0.160.160.16 times as great.
It is 0.40.40.4 times as great.
It is 2.52.52.5 times as great.
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.