iGCSE Biology - The Eye

Radial muscles are one set of muscles involved in the iris reflex. Name the other set.

• Circular muscles

• Suspensory ligaments

• Ciliary muscles

• Biceps

Which part of the eye provides a link to the brain?

• Cornea

• Lens

• Conjuctiva

• Optic nerve

What is this?

• Lens
• Pupil
• Iris
• Cornea

What is this?

• Optic Nerve
• Optic Disc
• Retina
• Sclera

What is this?

• Cornea
• Choroid
• Cones
• Lens

#3 Refers to the circular structure that surrounds the pupil and regulates the amount of light entering the eye.

• Cornea

• Pupil

• Retina

• Iris

# 5 refers to the layer of receptor cells at the back of the eye in which the image is focused

• Retina

• Lens

• Optic Nerve

• Lens

The white part of the eye made of a tough material

• lens

• sclera

• retina

• optic nerve

Why does your pupil increase in size when you enter a dark room?

• To protect the eye
• to allow more light to enter the  eye
• to allow less light to enter the eye
• to look like a  pirate

What part of the eye holds the lens in place?

• cornea
• ciliary muscles
• pupil
• retina