| The given graphs show the amount of different antibodies P and Q in the blood of a person during a pathogenic infection and after complete recovery. |
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| What could be inferred from the given graphs? |
A) The person might have suffered from two pathogenic infections simultaneously for which his body produced antibodies P and Q.
B) The person has acquired artificial active immunity for pathogen against which his body produced antibody Q.
C) This time the person suffered from the pathogenic infection for which his body produced antibody Q.
D) The person has acquired passive immunity for both the pathogens for which his body produced antibodies P and Q.
Correct Answer: C
Solution :
The given graphs indicate that this time the person has suffered from pathogenic disease for which his body produced antibody Q as its amount was very high during infection which reduced significantly after recovery. Antibody P is present in small amount consistently in the person's blood which indicates that they are memory cells and the person is either vaccinated for this pathogen (artificial active immunity) or has contracted the pathogenic disease and recovered from it (natural active immunity). Small amount of antibody Q in the blood after recovery from infection is actually the memory cells which shows that person has acquired natural active immunity against this disease.
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