Compare and contrast passive and active immunity

Question

What will be an ideal response?

Answer 1

In both cases, a organism is immune because it has antibodies that confer resistance to a specific antigen. In passive resistance, the antibodies are produce by one organism and are injected into a second, providing instant protection. But the second organism has immunity only as long as the antibodies last, and will not have memory cells that can make more antibodies when it is faced with a subsequent challenge. In active immunity, the organism makes its own antibodies. This takes longer, because the organism must figure out which B cells to activate, and then wait for them to produce antibody, but it does result in permanent memory of the foreign antigen.