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Solution


Q.

Assertion: Left atrium possesses the thickest muscles.
Reason: Left atrium receives oxygenated blood from the lungs.
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.

(4)

Left ventricle has thickest muscles because it pumps the blood to the whole body. Thus, assertion is false but reason is true.