A student tests a leaf for starch using iodine solution. Which result shows that the leaf contains starch?
The iodine solution stays orange-brown.
The iodine solution turns brick red.
The iodine solution turns blue-black.
The iodine solution turns purple.
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.