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  4. Assertion: Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin. Reason: Plasma without fibrinogen and blood corpuscles is called serum.

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Q. Assertion : Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.
Reason : Plasma without fibrinogen and blood corpuscles is called serum.

Body Fluids and Circulation

Solution:

Plasma contains prothrombin and fibrinogen. During clotting, inactive prothrombin converts to active thrombin. Thrombin acts as a proteolytic enzyme to separate two peptides from the soluble plasma protein fibrinogen molecule to form insoluble fibrin monomer. The part of blood plasma in the clotted area is squeezed out as a clear fluid called blood serum. The serum is plasma except that it lacks fibrinogen and corpuscles. It is, therefore, unable to clot. So, the correct answer is 'Both Assertion and reason are correct but the reason is not the correct explanation for Assertion'.