The Figure shows a section through the human eye.
Figure

Name structures J and K.
Structure M carries nerve impulses from the eye to the brain. Name structure M.
Give the letter of the structure that light passes through first when it enters the eye.
102 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.