$B$-cells are lymphocytes which produce the humoral immunity. These cells are produced by

Colostrum, the yellowish fluid, secreted by mother during the Inittlal days of lactation is very essentlal to impart immunity to the newbom infants because it contains

After vaccination the body builds up

When an organ is transplanted and is rejected by the body, the lymphocytes are produced by

Assertion: Artificially acquired passive immunity results when antibodies or lymphocytes produced outside the host are introduced into a host.

Reason: A bone marrow transplant given to a patient with genetic immunodeficiency is an example of artificially acquired passive immunity.

A condition that occurs when the immune system mistakenly attacks and destroys healthy body tissue is called