A visitor watches patterned fish in a brightly lit aquarium tank. The tank lighting is then reduced.
The table gives information about two parts of the eye that light passes through.
Complete the table by naming each part.
| Information | Name |
|---|---|
| The opening in the iris that allows light to enter the eye | __________ |
| The transparent, flexible structure behind this opening that fine-focuses light onto the retina | __________ |
The table shows two observations made by the visitor.
Give the type of receptor cell mainly responsible for each observation.
| Observation | Type of receptor cell |
|---|---|
| In bright light, the visitor can distinguish the different colours of the patterns on the fish. | __________ |
| In the reduced light, the visitor can still see the fish but cannot distinguish their colours. | __________ |
State what a receptor cell produces when light reaches it.
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.