Directions : In the following questions a statement of assertion (A) ...
Acquired immunity is learned, it is not present at birth.
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Directions : In the following questions a statement of assertion (A) ...
Assertion (A): Acquired immunity is pathogen specific.
Reason (R): It is not present since birth.
The correct answer is option A: Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Explanation:
Acquired Immunity:
Acquired immunity is a type of immunity that develops after exposure to a specific pathogen or antigen. It is also known as adaptive immunity. Acquired immunity involves the activation of specific immune cells, such as T cells and B cells, which recognize and respond to the antigens present on the pathogen.
Pathogen Specific:
Acquired immunity is pathogen specific, meaning that it is targeted towards a particular pathogen or antigen. When the immune system encounters a specific pathogen, it produces a targeted response to eliminate the pathogen and prevent future infections by the same pathogen. This specificity is achieved through the recognition of antigens by immune cells.
Not Present Since Birth:
The reason mentioned in the statement that acquired immunity is not present since birth is incorrect. Acquired immunity is not present at birth, but it develops over time as the immune system encounters and responds to various pathogens. Newborn babies have a certain degree of protection from infections due to the passive immunity acquired from their mother, but they do not have fully developed acquired immunity.
Supporting the Assertion:
The assertion is supported by the fact that acquired immunity is pathogen specific. This means that the immune system can mount a specific response against a particular pathogen, but it may not be effective against other pathogens. This specificity is important for effective immune responses and protection against different infectious agents.
Conclusion:
In conclusion, acquired immunity is indeed pathogen specific, and this specificity allows the immune system to recognize and respond to specific pathogens. The reason given in the statement is incorrect as acquired immunity develops over time and is not present since birth. Therefore, the correct answer is option A: Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
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