Secondary 3_Structure of the eye

1. What is the function of choroid?

• Change the size of pupil

• Prevents internal reflection

• Change the size of lens

• Controls the amount of light entering the eye

2. What is the function of retina?

• Carry nerve impulses

• Maintain shape of the eye

• Produce nerve impulses

• Helps in refraction of light

3. Name the part labelled X.

• Yellow spot

• Sclera

• Choroid

• Blind spot

4. Structure P is responsible to control the size of the pupil. Name structure P.

5. Choose the correct option on part of the eye that functions to change the thickness of structure S.

• Eye lens

• Ciliary muscle

• Choroid

• Sclera

6. Choose the three structures which have similar functions.

• Eye lens, Vitreous humour and Choroid

• Pupil, Iris and Sclera

• Retina, Sclera and Choroid

• Sclera, Aqueous humour and Vitreous humour

7. Structure Y helps to supply oxygen and nutrients to the eye. What is structure Y?

8. What is the function of conjunctiva?

• Focuses light on the retina

• Holds the eye lens in position

• Protects the front part of the sclera

• Carry nerve impulses to the brain

9. Which of the following options describes blind spot accurately?

• Contains many photoreceptors

• Contains no photoreceptors

• Very sensitive to light

• Helps to maintain the shape of the eyeball

10. Name the part labelled as R.

• Suspensory ligament

• Sclera

• Yellow spot

• Optic nerve