UPSC Prelims 2022·GS1·science-and-technology·science and technology

Which one of the following statements best describes the role of B cells and T cells in the human body?

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Last updated 23 May 2026, 3:31 pm IST
  1. AThey protect the body from environmental allergens.
  2. BThey alleviate the body's pain and inflammation.
  3. CThey act as immunosuppressants in the body.
  4. DThey protect the body from the diseases caused by pathogens.Correct

Explanation

B cells (B lymphocytes) and T cells (T lymphocytes) are both types of white blood cells (lymphocytes) that play crucial roles in the adaptive (specific) immune system of the human body. They are responsible for recognizing and targeting specific pathogens (like bacteria, viruses, fungi, and parasites) and abnormal cells (like cancer cells). B cells: Primarily produce antibodies, which are proteins that target and neutralize specific pathogens or toxins. This is known as humoral immunity. T cells: Directly kill infected cells (cytotoxic T cells) or help regulate other immune cells (helper T cells). This is known as cell-mediated immunity. Together, their coordinated action provides specific, long-lasting immunity against a wide range of diseases caused by pathogens. Therefore, option D best describes their role.
science-and-technology: Which one of the following statements best describes the role of B cells and T cells in the human body?
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