Question:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In Anthrax, clot formation does not take place.
Reason R: Fibrinolysin produced by bacteria liquefies fibrin.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In Anthrax, clot formation does not take place.
Reason R: Fibrinolysin produced by bacteria liquefies fibrin.
In light of the above statements, choose the most appropriate answer from the options given below.
Assertion A: In Anthrax, clot formation does not take place.
Reason R: Fibrinolysin produced by bacteria liquefies fibrin.
In light of the above statements, choose the most appropriate answer from the options given below.
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A classic veterinary pathology fact is that anthrax blood is dark, unclotted, and tarry due to bacterial fibrinolysin. This feature is frequently tested in microbiology and veterinary competitive examinations.
Updated On: Aug 24, 2026
- Both A and R are correct and R is the correct explanation of A.
- Both A and R are correct but R is NOT the correct explanation of A.
- A is correct but R is not correct.
- A is not correct but R is correct.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Anthrax is an acute infectious disease caused by Bacillus anthracis.
A characteristic diagnostic feature is that blood from infected animals is dark, tarry, and fails to clot because bacterial enzymes dissolve fibrin.
Detailed Explanation:
Assertion A:
In anthrax, clot formation does not occur.
The blood remains fluid due to the destruction of the fibrin network, which is essential for coagulation.
Hence, Assertion A is true.
Reason R:
Bacillus anthracis produces fibrinolysin, an enzyme that breaks down fibrin.
Since fibrin forms the meshwork responsible for blood clotting, its liquefaction prevents clot formation.
Therefore, Reason R is also true.
Step 2: Relationship between Assertion and Reason:
The absence of clotting in anthrax is directly caused by the action of fibrinolysin on fibrin.
Thus, the Reason correctly explains the Assertion.
Step 3: Final Answer:
Both Assertion A and Reason R are correct, and Reason R is the correct explanation of Assertion A.
\[ \boxed{(A) Both A and R are correct and R is the correct explanation of A. \]
Anthrax is an acute infectious disease caused by Bacillus anthracis.
A characteristic diagnostic feature is that blood from infected animals is dark, tarry, and fails to clot because bacterial enzymes dissolve fibrin.
Detailed Explanation:
Assertion A:
In anthrax, clot formation does not occur.
The blood remains fluid due to the destruction of the fibrin network, which is essential for coagulation.
Hence, Assertion A is true.
Reason R:
Bacillus anthracis produces fibrinolysin, an enzyme that breaks down fibrin.
Since fibrin forms the meshwork responsible for blood clotting, its liquefaction prevents clot formation.
Therefore, Reason R is also true.
Step 2: Relationship between Assertion and Reason:
The absence of clotting in anthrax is directly caused by the action of fibrinolysin on fibrin.
Thus, the Reason correctly explains the Assertion.
Step 3: Final Answer:
Both Assertion A and Reason R are correct, and Reason R is the correct explanation of Assertion A.
\[ \boxed{(A) Both A and R are correct and R is the correct explanation of A. \]
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