Which of the following statements is correct ?

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Acquired immunity is pathogen specific.

The exaggerated response of the immune system to certain antigens present in the environment is called Auto-immunity.

Bone marrow acts as a filter of the blood by trapping blood borne micro-organisms.

AIDS is caused by a group of viruses called rhinovirus.

answer is A.

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Detailed Solution

Acquired immunity is pathogen specific. It is characterised by memory. This means when our body encounters a pathogen for the first time it produces a response called primary response which is of low intensity. Subsequent encounter with the same pathogen elicits a highly intensified secondary or anamnestic response. It is due to the memory of the first encounter.

The exaggerated response of the immune system to certain antigens present in the environment is called Hypersensitivity.

Spleen acts as a filter of the blood by trapping blood borne micro-organisms.

Common cold is caused by a group of viruses called rhinovirus. AIDS is caused by HIV, which belongs to a group of retrovirus.

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