A researcher records responses from two groups of retinal receptor cells, P and Q.
At low light intensity, cells in group P generate electrical impulses but cells in group Q do not. In bright light, cells in group Q show different responses to red, green and blue light.
The two groups contain rod cells and cone cells.
Which statement explains the results for group Q?
Group Q contains cone cells because cones detect colour and work best in bright light.
Group Q contains rod cells because rods detect colour only in bright light.
Group Q contains rod cells because rods respond separately to red, green and blue light.
Group Q contains cone cells because cones are more sensitive at low light intensity.
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.