A student investigates a plant with variegated leaves. Each leaf has green areas and white areas. The white areas contain no chlorophyll. The plant is kept in bright light for 24 hours. The student then tests a leaf for starch with iodine solution. The table shows the results. Table
| Area of leaf | Colour after adding iodine solution |
|---|---|
| green | blue-black |
| white | orange-brown |
| Which conclusion is supported by these results? |
Light is needed for photosynthesis.
Carbon dioxide is needed for photosynthesis.
Chlorophyll is needed for photosynthesis.
Water is needed for photosynthesis.
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.