A boy looks at a ball that is coming towards him.
Describe how light from the ball produces nerve impulses that travel to the boy's brain.
The ball moves into a dark shadow.
State the type of receptor cell that the boy mainly uses to see the ball in the shadow.
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.