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Solution


Q.

Assertion: The curvature of the eye lens can be modified to some extent by the ciliary muscles.
Reason: The ciliary muscles are used to modify the curvature of lens.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true.  

Ans.

(1)

The curvature of the eye lens is modified to change the focal length. When the muscles are relaxed, the lens becomes thin. Therefore, there is an increase in the focal length. This enables us to see distant objects clearly. This modification in lens is done by ciliary muscles. Thus, both assertion and reason are correct and reason is the correct explanation of assertion.