Match List-I (types of white blood cells) with List-II (their functio…

Match List-I (types of white blood cells) with List-II (their functions).

List-I	List-II
(A) T cells	(I) Destroy invaders
(B) B cells	(II) Produce antibodies
(C) Natural killer cells	(III) Fight viruses and tumours
(D) T-helper cells	(IV) Increase immunological activity

Choose the correct answer from the options given below:

Answer & explanation

Correct answer: option 1

The correct answer is Option (1) → A-I, B-II, C-III, D-IV

List-I	List-II	Reason
(A) T cells	(I) Destroy invaders	T cells are the white blood cells that destroy invaders. They act directly on foreign bodies in the body.
(B) B cells	(II) Produce antibodies	B cells produce antibodies. Antibodies help the immune system act against antigens.
(C) Natural killer cells	(III) Fight viruses and tumours	Natural killer cells take part in the fight against both viruses and tumours.
(D) T-helper cells	(IV) Increase immunological activity	T-helper cells increase immunological activity. HIV, the virus causing AIDS, attacks these cells.

NCERT (2026-27): “Stress and the Immune System
Stress can cause illness by impairing the workings of the immune system. The immune system guards the body against attackers, both from within and outside. Psychoneuroimmunology focuses on the links between the mind, the brain and the immune system. It studies the effects of stress on the immune system. How does the immune system work? The white blood cells (leucocytes) within the immune system identify and destroy foreign bodies (antigens) such as viruses. It also leads to the production of antibodies. There are several kinds of white blood cells or leucocytes within the immune system, including T cells, B cells and natural killer cells. T cells destroy invaders, and T-helper cells increase immunological activity. It is these T-helper cells that are attacked by the Human Immuno Deficiency Virus (HIV), the virus causing Acquired Immuno Deficiency Syndrome (AIDS). B cells produce antibodies. Natural killer cells are involved in the fight against both viruses and tumours.”

Match List-I (types of white blood cells) with List-II (their functions).

List-I	List-II
(A) T cells	(I) Destroy invaders
(B) B cells	(II) Produce antibodies
(C) Natural killer cells	(III) Fight viruses and tumours
(D) T-helper cells	(IV) Increase immunological activity

Choose the correct answer from the options given below:

Answer & explanation

Correct answer: option 1

The correct answer is Option (1) → A-I, B-II, C-III, D-IV

List-I	List-II	Reason
(A) T cells	(I) Destroy invaders	T cells are the white blood cells that destroy invaders. They act directly on foreign bodies in the body.
(B) B cells	(II) Produce antibodies	B cells produce antibodies. Antibodies help the immune system act against antigens.
(C) Natural killer cells	(III) Fight viruses and tumours	Natural killer cells take part in the fight against both viruses and tumours.
(D) T-helper cells	(IV) Increase immunological activity	T-helper cells increase immunological activity. HIV, the virus causing AIDS, attacks these cells.