Form 3 Chapter 1 Stimuli and Responses (1.2 Eye)

What is true about cornea from our eyeballs?

• Transparent layer which refracts and focuses light onto the retina.

• The coloured part of the eye which controls the size of the pupil.

• Transparent membrane which protects the front part of the sclera.

• Strong fibres which hold the eye lens in its position.

What is true about choroid from our eyeballs?

• Layer containing photoreceptors which detect light and produces nerve impulses.

• Black layer that prevents refraction of light in the eye and supplies oxygen and nutrients to the eye.

• Nerve fibres which carry nerve impulses.

• Strong layer that maintains the shape of the eye and protects it.

Which of the following characteristics of retina is incorrect?

• has 2 types of photoreceptors, rod cells and cone cells.

• has an even distribution of photoreceptors across the layer.

• has a blind spot with no photoreceptors.

• has sensory neurones attaching to photoreceptors.

Which of the following structures are involved to allow a clear image being formed on the yellow spot?

• sclera, choroid and retina

• cornea, aqueous humour, lens, vitretous humour and retina

• cornea, aqueous humour, iris, vitreous humour and retina

What of the consequence if one has cloudy lens is incorrect?

• Image is formed on retina.

• Blurred image is formed on retina.

• No visual sensation is observed.

• Visual sensation is impaired.

Which of the following serve(s) as effector(s) of our eyes? (There are total 2 answers)

• retina

• suspensory ligament

• circular iris muscle

• ciliary muscle

Name structure A

• Pupil

• Iris

• Cornea

• Retina

Name Structure B

• Lens

• Pupil

• Sclera

• Cornea

Name structure G

• Lens

• Pupil

• Optic Nerve

• Ciliary Muscles

What structure is responsible for carrying sensory impulses from the eye to the brain?

• Retina

• Iris

• Optic Nerve

• Rod cells & Cone cells