Question

The figure given below refers to the vertical section of the eye of a mammal. Study the figure carefully and answer the following questions.

1. Label the guidelines shown as 1 to 10.
2. Write one important role of parts shown as 3 and 7.
3. Write one structural difference between the parts shown as 9 and 10.
4. Mention one functional difference between the parts shown as 6 and 8.

Answer 1

1.     
   1. Aqueous Humour
   2. Lens
   3. Iris
   4. Cornea
   5. Conjunctiva
   6. Sclera
   7. Choroid
   8. Retina
   9. Fovea centralis
   10. Optic Nerve
2. Iris: The iris has radial and circular muscles that can enlarge or constrict the pupil.
   This regulates the amount of light entering the eyes.
   Choroid: The choroid includes blood veins that supply the eyeball.
3. Fovea centralis: The fovea is located in the centre of the macula lutea of the retina.
   Optic nerve: The optic nerve connects the eye to the brain, which carries impulses formed by the retina.
4. Sclera: The sclera is a protective, tough white behind the retina.
   Cornea: The cornea is a transparent coating that shields the eye's coloured component and allows light to pass through.