1.

Characters of acquired immunity areA. Specificity of antigenB. Difference between self and non-selfC. Retains memoryD. All off these

Answer» Correct Answer - D
(d) Acquired immunity is obtained during the life of an individual to a particular micro-organism due to previous infection, vaccination or inoculation of antiserum. It has four unique characteristics :
(i) Specificity: It is specific for each & every type of pathogen.
(ii) Diversity : It operates against the whole diversity of pathogenic organisms, their toxins & pollutants.
(iii) Difference between self & non-self : It can differentiate molecules & cells of foreign origin from those of self.
(iv) Memory : the immunity against a pathogen developed during an initial infection is retained by the individual so that second encounter with the pathogen invites a heightened immune response.


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