In the evening, a gardener notices that the red flowers in her garden look grey. Earlier in the day, the same flowers looked red.
Name the part of the eye that contains rod cells and cone cells.
Give two differences between rod cells and cone cells.
Explain why the red flowers look grey in the evening.
42 exam-style questions on Edexcel GCSE Biology 2.4 The eye, covering 2.4.1 Structure and function of the eye and 2.4.2 Eye defects and their correction. Each one has a worked solution and a mark scheme showing where the marks go.