A jeweller looks at a clock on the far wall of a dim workshop. A bright inspection lamp is then switched on and the jeweller examines a gemstone held close to the eye.
Which combination of changes occurs in the suspensory ligaments and in the circular muscles of the iris?
The suspensory ligaments slacken and the circular muscles relax.
The suspensory ligaments tighten and the circular muscles contract.
The suspensory ligaments tighten and the circular muscles relax.
The suspensory ligaments slacken and the circular muscles contract.
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.