Question

Active immunity means
A.Resistance developed after disease
B.Increasing quantity of blood
C.Resistance developed before the disease
D.Increasing rate of heartbeat

Answer 1

Active immunization is the introduction of immunity after an individual is exposed to an antigen. Antibodies are formed by the individual and may be stored permanently.

Complete answer:
Active immunization may occur naturally when a microbe or an antigen enters a body of an individual who has not yet come into direct contact with an antigen and has no priorly developed antibodies for defense mechanism. The immune system will trigger and eventually develop antibodies against the antigen, but this is a deliberate process and, if the microbe is fatal, there may not be sufficient time for the antibodies to be utilized by the body.
Artificial active immunization is induced in an individual when the microbe is directly injected into the individual before the body directly comes in contact with the microbe and develops antibodies against it naturally. The microbe is attenuated i.e. its pathological activity of the microbe is suppressed so that it will not harm the infected person. Depending on the type of microbe which causes the disease, this method also works with dead microbes, parts of the microbe, or treated toxins from the microbe. The most common example of this type of active immunization is vaccinations, which have led to several arguments in the past and even present considering their safety and efficacy.
Hence, the correct option is (A) Resistance developed after disease.

Note: In the case of active immunity, the Antibodies are produced by B cells of the adaptive immune system, mostly from the differentiated B cells called plasma cells. Antibodies can mainly occur in two physical forms, a soluble form that is produced from the cell to be free in the blood plasma, and a membrane-bound form that is linked to the surface of a B cell and is stated to be the B-cell receptor.