Identify 'X':
Important Questions on Sense Organs
Redraw the picture given below. Identify the name indicated and label the parts
The part refracts light rays into the eye.
Answer the following questions briefly:
Explain how the human eye adapts itself to bright light and dim light.
State the function of the following.
Ciliary muscles
The A leaves the eye and the retinal blood vessels enter it at a point medial to and slightly above the posterior pole of the eyeball. B is not present in that region and hence it is called the C . At the posterior pole of the eye lateral to the C , there is a yellowish pigmented spot called D with a central pit called the E .
Given below are certain functional activities of specific structures in the body of living organisms. Name the structure responsible for the same.
Helps to change the focal length of the eye lens
The diagram above shows the front view of the human eye in different conditions of dim and bright light. Write the function of the part labelled.
Iris of the eye
The diagram above shows a mammalian eye as seen from the front:
Name the muscles that bring about the change from A to B.
Suspensory ligament of the eye.
