A farmer grows lettuces in a greenhouse.
In winter, she burns paraffin in heaters inside the greenhouse. Burning paraffin releases heat and carbon dioxide.
Explain how burning paraffin helps the lettuces to grow faster.
The farmer also switches on lamps in the greenhouse at night.
Explain why this increases the yield of lettuces.
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.