Edexcel IGCSE Biology 2.91 Glucose homeostasis
Practise labelling eye structures and explaining how the cornea, lens, retina and iris affect light entry and vision quality.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- identify the cornea, lens and retina on eye diagrams and link each structure to its function
- explain cataracts or iris pigment effects using light entry, retina stimulation and blurred vision
- interpret field-of-view diagrams to explain depth perception in predators with forward-facing eyes
2.91 Eye structure and function question 1
The diagram shows the structure of a human eye.
Which of these is the structure labelled X ?
A
conjunctiva
B
cornea
C
lens
D
retina
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