A test records the smallest light intensity at which two types of retinal cell respond. Smaller values indicate greater sensitivity.
Table
| Cell type | Minimum intensity / arbitrary units | Distinguishes colour |
|---|---|---|
| X | 2 | No |
| Y | 80 | Yes |
At an intensity of 10 arbitrary units, which prediction is correct?
X cells respond and the person can detect outlines without distinguishing colours.
Y cells respond and the person can detect outlines without distinguishing colours.
X cells respond and the person can distinguish colours as well as detect outlines.
Y cells respond and the person can distinguish colours as well as detect outlines.
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.