A person has normal rod cells but some types of cone cell do not function normally.
Which pair of observations is most likely?
Objects are not detected in dim light; all colours are easy to distinguish.
Objects are detected in dim light; all colours are easy to distinguish.
Objects are detected in dim light; some colours are difficult to distinguish.
Objects are not detected in dim light; some colours are difficult to distinguish.
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.