1.1. A person visits an eye doctor to have an eye test. On the wall of the doctor’s room is a diagram of an eye.

(i)

Name the part labelled X.

[1]

(ii)

Describe one way in which the structure of X is related to its function.

[2]

(iii)

Name layer Y.

[1]

1.2. As part of the eye test, the doctor shines a bright light into the eye and takes a picture. 

The picture shows layer Y and the choroid layer behind it.

(i) Name structure Z.

[1]

(ii) Layer Y does not contain blood vessels.  Explain how the blood vessels in the choroid layer are important for layer Y.

[4]

1.3. When the bright light is shone into the eye there is a pupil reflex which causes the pupil to become smaller.

Explain how named parts of the eye and of the nervous system are involved in this pupil reflex.