Antigen binds to antibody. The binding is the result of

What is primary immune response?

Which type of immunity is characterized by memory?

Given below are two statements.
Statement $I$: Passive immunity is acquired when readymade antibodies are received by body cells.
Statement $II$: Resistance induced by $BCG$ vaccine is an example of passive immunity.
In the light of the above two statements,choose the correct answer from the options given below.

Which of the following is $NOT$ associated with the bone marrow?

$A$ - Colostrum contains several antibodies.
$R$ - Due to colostrum,immunity is decreased in the child.