Class 12 - Biology - Understanding Immunity (Q & A) - Chapter: Human Health and Diseases
Q1: Define immunity.
Answer: Immunity means resistance to infections and antigens. Immunity is the capacity of an organism to resist or defend itself from the development of a disease.
Q2: What is an antigen? Give some examples.
Answer: Any substance or molecule that induces the immune system to produce antibodies against it is called an antigen. Examples include pathogens, virus, pollens, chemicals etc.
Q3: Name two main types of immunities.
Answer:
1. Innate immunity
2. Acquired immunity