Q.

Assertion: Cataract causes partial or complete loss of vision.
Reason: The eyeball is approximately elliptical in shape.

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.

(3)

Sometimes, the crystalline lens of people at old age becomes milky and cloudy. This condition is called cataract. It causes partial or complete loss of vision. The eyeball is spherical in shape, not elliptical. Thus, the given assertion is true and reason is false.