Immune System Quiz

Question 1

What type of white blood cell produces antibodies?

Accepted Answer

B cells

Answer

T cells

Answer

Neutrophils

Answer

Natural killer cells

Question 2

What is the largest organ of the immune system?

Accepted Answer

Spleen

Answer

Thymus

Answer

Lymph nodes

Answer

Bone marrow

Question 3

Which vitamin is well-known for supporting immune function and is found in citrus fruits?

Accepted Answer

Vitamin C

Answer

Vitamin A

Answer

Vitamin B12

Answer

Vitamin D

Question 4

What term describes the immune system's ability to remember a pathogen and respond faster on re-exposure?

Accepted Answer

Immunological memory

Answer

Innate immunity

Answer

Passive immunity

Answer

Herd immunity

Question 5

What are antibodies also called?

Accepted Answer

Immunoglobulins

Answer

Antigens

Answer

Lymphocytes

Answer

Cytokines

Question 6

Which gland in the chest is responsible for maturing T cells?

Accepted Answer

Thymus

Answer

Thyroid

Answer

Adrenal gland

Answer

Pancreas

Question 7

What is the 'first line of defence' in the immune system?

Accepted Answer

Physical barriers like skin and mucous membranes

Answer

Antibodies

Answer

T cells

Answer

The lymphatic system

Question 8

An allergic reaction is caused by the immune system overreacting to a harmless substance. Which antibody is primarily involved?

Accepted Answer

IgE

Answer

IgG

Answer

IgM

Answer

IgA

Question 9

What does a vaccine do to stimulate immunity?

Accepted Answer

Introduces an antigen to trigger an immune response without causing full disease

Answer

Introduces live pathogens to infect the body

Answer

Directly provides antibodies to fight infection

Answer

Suppresses the immune system temporarily

Question 10

Chronic stress has what effect on the immune system?

Accepted Answer

It suppresses immune function

Answer

It strengthens immune responses

Answer

It has no effect on immunity

Answer

It causes the immune system to attack healthy tissue

Question 11

What is an autoimmune disease?

Accepted Answer

When the immune system attacks the body's own healthy cells

Answer

A disease caused by a very strong immune system

Answer

A disease you can only get once

Answer

An allergy to one's own skin

Question 12

Which of the following best supports a healthy immune system?

Accepted Answer

Regular exercise, good sleep, and a balanced diet

Answer

Sleeping 4 hours a night

Answer

Avoiding all outdoor exposure

Answer

Taking antibiotics preventively

Question 13

What is 'herd immunity'?

Accepted Answer

When enough of a population is immune that a disease can no longer spread easily

Answer

When animals develop immunity before humans

Answer

When all members of a community are vaccinated at the same time

Answer

Immunity that only works in groups

Question 14

What is the role of lymph nodes in the immune system?

Accepted Answer

Filtering lymph fluid and housing immune cells that detect pathogens

Answer

Producing red blood cells

Answer

Storing vitamin C for immune use

Answer

Producing the hormone cortisol

Question 15

Gut health is linked to immunity. Approximately what percentage of the immune system is in the gut?

Accepted Answer

70%

Answer

20%

Answer

40%

Answer

90%

Question 16

Which mineral, often found in nuts and seeds, plays an important role in immune function and wound healing?

Accepted Answer

Zinc

Answer

Iron

Answer

Magnesium

Answer

Calcium

Question 17

What are cytokines?

Accepted Answer

Chemical messengers that coordinate immune responses

Answer

A type of white blood cell

Answer

Antibodies targeting viruses

Answer

Enzymes that break down bacteria

Question 18

Why is breastfeeding beneficial for infant immune health?

Accepted Answer

It transfers the mother's antibodies (especially IgA) to the baby

Answer

It contains stem cells that grow into T cells

Answer

It permanently prevents all childhood illness

Answer

It activates the baby's thymus gland faster

Question 19

What happens during inflammation, a key part of immune response?

Accepted Answer

Blood flow increases, immune cells rush to the site, causing redness, heat, and swelling

Answer

Blood flow decreases to the affected area

Answer

Immune cells are isolated away from infection

Answer

The body lowers its temperature to slow bacterial growth

Question 20

Which of the following weakens the immune system over time?

Accepted Answer

Excessive alcohol consumption

Answer

Regular moderate exercise

Answer

A Mediterranean diet

Answer

Adequate sleep of 7–9 hours