Frequently Asked MCQ quiz on the WBC: Types and Functions Questions with Answers – MCQ Quiz for Competitive Exam Preparation – These questions given will be useful for competitive exams preparation.

“WBC” typically stands for “White Blood Cell.” White blood cells are an essential part of the immune system and play a crucial role in defending the body against infections and foreign invaders. They are produced in the bone marrow and circulate in the bloodstream, where they can detect and destroy pathogens such as bacteria, viruses, and fungi. An abnormal WBC count can indicate various health conditions, including infections, inflammatory diseases, autoimmune disorders, and certain types of leukemia.

What is the primary function of white blood cells (WBCs)?

a) Oxygen transport

b) Immune defense

c) Blood clotting

d) pH regulation

Answer: b) Immune defense

What is another name for white blood cells?

a) Leukocytes

b) Erythrocytes

c) Thrombocytes

d) Granulocytes

Answer: a) Leukocytes

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Which of the following is not a type of white blood cell?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Thrombocytes

Answer: d) Thrombocytes

Which type of white blood cell is the most abundant in the bloodstream?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Eosinophils

Answer: a) Neutrophils

What is the primary function of neutrophils?

a) Phagocytosis

b) Antibody production

c) Histamine release

d) Allergic reactions

Answer: a) Phagocytosis

Which type of white blood cell plays a crucial role in antibody production?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Eosinophils

Answer: b) Lymphocytes

Which of the following is a characteristic of eosinophils?

a) Phagocytosis of pathogens

b) Release of histamine

c) Allergic reactions

d) Production of antibodies

Answer: c) Allergic reactions

What is the function of basophils in the immune system?

a) Phagocytosis

b) Antibody production

c) Release of histamine

d) Removal of damaged cells

Answer: c) Release of histamine

Which type of white blood cell is known for its role in allergic reactions and parasitic infections?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Eosinophils

Answer: d) Eosinophils

What is the primary function of monocytes?

a) Phagocytosis

b) Antibody production

c) Histamine release

d) Blood clotting

Answer: a) Phagocytosis

Which type of white blood cell is involved in the formation of pus during infections?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Eosinophils

Answer: a) Neutrophils

What is the role of dendritic cells in the immune system?

a) Phagocytosis

b) Antigen presentation

c) Histamine release

d) Antibody production

Answer: b) Antigen presentation

Which type of white blood cell is responsible for antigen presentation to other immune cells?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Dendritic cells

Answer: d) Dendritic cells

What is the primary function of natural killer (NK) cells?

a) Phagocytosis

b) Antibody production

c) Killing infected cells and tumor cells

d) Allergic reactions

Answer: c) Killing infected cells and tumor cells

Which of the following is NOT a granulocyte?

a) Neutrophils

b) Eosinophils

c) Monocytes

d) Basophils

Answer: c) Monocytes

Which type of white blood cell is responsible for secreting cytokines to regulate immune responses?

a) Neutrophils

b) Lymphocytes

c) Monocytes

d) Eosinophils

Answer: c) Monocytes

What is the primary function of B lymphocytes (B cells)?

a) Phagocytosis

b) Killing infected cells

c) Antibody production

d) Allergic reactions

Answer: c) Antibody production

Which of the following white blood cells is NOT involved in adaptive immunity?

a) Neutrophils

b) T lymphocytes (T cells)

c) B lymphocytes (B cells)

d) Dendritic cells

Answer: a) Neutrophils

Which type of white blood cell matures in the thymus gland?

a) Neutrophils

b) B lymphocytes (B cells)

c) T lymphocytes (T cells)

d) Eosinophils

Answer: c) T lymphocytes (T cells)

What is the primary function of T lymphocytes (T cells)?

a) Phagocytosis

b) Antibody production

c) Direct killing of infected cells

d) Histamine release

Answer: c) Direct killing of infected cells

Which of the following white blood cells is responsible for the secondary immune response upon re-exposure to an antigen?

a) Neutrophils

b) Memory B cells

c) Memory T cells

d) Dendritic cells

Answer: c) Memory T cells

What is the primary function of memory B cells?

a) Phagocytosis

b) Direct killing of infected cells

c) Antibody production upon re-exposure to an antigen

d) Histamine release

Answer: c) Antibody production upon re-exposure to an antigen

Which type of white blood cell plays a critical role in coordinating the immune response?

a) Neutrophils

b) Macrophages

c) Helper T cells (CD4+)

d) Basophils

Answer: c) Helper T cells (CD4+)

What is the primary function of regulatory T cells (Tregs)?

a) Direct killing of infected cells

b) Promotion of allergic reactions

c) Suppression of excessive immune responses

d) Phagocytosis

Answer: c) Suppression of excessive immune responses

Which white blood cell type releases chemical mediators such as cytokines to regulate immune responses?

a) Neutrophils

b) Macrophages

c) Eosinophils

d) Basophils

Answer: b) Macrophages

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