IGCSE The eye

Identify the structure that refracts light as it enters the eye

• Fovea

• Cornea

• Iris

• Lens

State the light sensitive tissue found in the eye

Which structure contains two types of muscle and controls how much light can enter the eye?

• Iris

• Pupil

• Sclera

• Lens

Identify the receptor that is sensitive to red, green and blue light

• Rod cell

• Thermoreceptor

• Mechanoreceptor

• Cone cell

What type of receptors are found in the eye?

Identify the type of neurone that transmits nerve impulses to the brain in the optic nerve

• Relay neurone

• Sensory neurone

• Neurotransmitter

• Motor neurone

Which structure is a circular opening that lets light into the eye?

• Retina

• Blind spot

• Pupil

• Iris

Identify the region at the back of the eye where there are no photoreceptors

Which structures can adjust in shape to focus light on the retina?

• Iris

• Lens

• Cornea

• Pupil

State the involuntary action that occurs to limit the amount of light entering the eye