A) Cause standing of hairs in human skin in cold
B) Keep the valves of heart in position
C) Move cilia of some ciliated protozoans
D) Change focus of lense in human eye
Correct Answer: D
Solution :
Ciliary muscles by their contraction exerts tension over the zonule, the ligament which suspends the lens and stretch or relax the lens capsule. The lens has elasticity and hence change of tension on it changes the focal length of lens.
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