Explain how structures P and R help to produce a clear image.
[2]
d.
State the function of structure S.
[1]
Markscheme
2.4 The eye Questions
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.