Question

Resistance developed in an individual as a result of antigenic stimulus is
A) Natural immunity
B) Active acquired immunity
C) Passive acquired immunity
D) Artificial immunity

Answer 1

Antigenic stimulus can be any pathogen, antigen or foreign substance which can cause harm to the body of an organism. In order to kill or destroy that antigenic stimulus, the immune system becomes active.

Complete answer:
Natural immunity: -Natural immunity is the naturally occurring immunity. This type of immunity does not require any sensitization to the antigenic molecule or antigen.
Active acquired immunity:- Active acquired immunity occurs when a person is exposed to a live pathogen and develops the disease and develops immunity. When a microbe penetrates the body’s skin, mucous membrane or any other primary defenses it interacts with the immune system. Inside the body, B-cells produce antibodies that help to fight against that microbe. The adaptive immune response generated against the pathogen and it is long lasting or even life long. Vaccines work on this principle.
Passive acquired immunity:- Passive acquired immunity occurs during the pregnancy when antibodies are passed from the maternal blood to the fetal blood. Passive immunity can also be in the form of IgA and IgG which are found in the human colostrums and milk of the babies who are nursed. Human milk also contains oligosaccharides and mucins that adhere to the bacteria and viruses to interfere with their attachment to host cells.
Artificial immunity:-Artificial immunity is a kind of immunity by which the body is given immunity to a disease by intentionally exposure to a small quantity of it.
Therefore, it has been clear from the above discussion that the resistance developed in an individual as a result of antigenic stimulus is actively acquired immunity.

Hence, option B is the correct answer.

Note: The immune system is a complex network of the cells and proteins that defend the body against any kind of infection. The immune system also keeps the record of every microbe so it can recognize and destroy the particular microbe when it will enter the body next time.