A pupil becomes larger as a person enters a darker room.
Which statement links the responding structure to the benefit?
The retina changes the opening, allowing more light to reach receptor cells.
The iris changes lens curvature, allowing nearby objects to remain focused.
The iris changes the opening, allowing more light to reach receptor cells.
The retina changes lens curvature, allowing nearby objects to remain focused.
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.