Question

Assertion: Trypsin helps in blood digestion of predator animals.
Reason: Trypsin hydrolyzes fibrinogen.

a. Both assertion and reason are correct and reason is the correct explanation for assertion.
b. Both assertion and reason are correct but reason is not the correct explanation for assertion.
c. Assertion is correct but reason is incorrect.
d. Both assertion and reason are incorrect.

Answer 1

In animals trypsin is responsible for the hydrolysis of fibrinogen into fibrin. Fibrin threads polymerize and form an interlaced structure or meshwork which traps the blood cells, platelets, etc. into it to form a clot. Clot is a thick mass of coagulated liquid.

Complete answer:
- Trypsin is found in animals and basically it is a protein digesting enzyme. In predator animals it plays an important role in the digestion of blood which they drink from their prey i.e. the animal which is killed by others for food. Therefore, for the digestion of these blood the enzyme trypsin hydrolyzes fibrinogen into fibrin.
- Here, this hydrolysis process leads to the formation of a blood clot which helps in the digestion of blood taken from the prey. Fibrinogen is a component of blood and when it is converted into fibrin a gel like clump or cluster of blood is formed.
- The fibrin threads of the clot are joined together by weak non-covalent hydrogen bonds and hence the clot is easy to digest for predator animals.
- Thus, in humans 13 factors are involved in blood coagulation and fibrin threads are formed with the help of “Fibrin Stabilizing Factor”.

Hence, the correct answer is option (A).

Note: Predators are the animals that live by killing and eating other animals. In humans thrombin is responsible for the hydrolysis of fibrinogen into fibrin means thrombin does the same thing in humans as trypsin does in predator animals. Trypsin also helps in protein digestion in both humans as well as animals.