Practise Edexcel GCSE Biology 2.4 The eye with exam-style questions for Foundation and Higher tier. 47 questions covering 2.4.1 Structure and function of the eye and 2.4.2 Eye defects and their correction, matched to the Edexcel GCSE Biology (1BI0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.