Human Health and Diseases Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about vaccines is incorrect?

Vaccines stimulate the immune system to produce antibodies.
Vaccines provide immediate immunity.
Vaccines can contain inactivated or live-attenuated pathogens.
Vaccines help in the development of memory cells.
2

Vaccines do not provide immediate immunity; they take time to generate an immune response and develop memory cells.

Which of the following conditions is caused by excessive immune response to harmless antigens?

Allergy
AIDS
Cancer
Leukemia
1

Allergy occurs when the immune system overreacts to harmless antigens, such as pollen or dust.

Which of the following statements about passive immunity is correct?

Passive immunity is long-lasting and provides lifelong protection.
Passive immunity is acquired through antibodies from another source.
Passive immunity involves the production of memory cells.
Passive immunity is provided only by vaccination.
2

Passive immunity is acquired when ready-made antibodies are transferred from another source, such as maternal antibodies or antibody injections.

Which immunoglobulin is the first to be produced in response to an infection?

IgA
IgG
IgM
IgE
3

IgM is the first antibody produced during an initial immune response to an infection.

Which preventive measure is most effective against vector-borne diseases like malaria?

Washing hands frequently
Maintaining personal hygiene
Using mosquito nets and repellents
Drinking boiled water
3

Using mosquito nets, repellents, and eliminating mosquito breeding sites are effective measures against malaria.

Which of the following is the primary site of maturation for B-lymphocytes in humans?

Bone marrow
Thymus
Spleen
Lymph nodes
1

In humans, B-lymphocytes mature in the bone marrow before they participate in immune responses.

What is the primary function of histamine in allergic reactions?

Stimulates red blood cell production
Causes vasodilation and increases permeability of blood vessels
Enhances T-cell production
Acts as a neurotransmitter in the brain
2

Histamine is released from mast cells during allergic reactions, leading to vasodilation and increased vascular permeability.

Which of the following statements about lymphatic organs is correct?

The thymus is a secondary lymphoid organ.
Lymph nodes filter pathogens from the blood.
The spleen helps in filtering pathogens from the blood.
The bone marrow does not produce immune cells.
3

The spleen filters pathogens from the blood and plays an important role in immune defense.

Which immune cells are responsible for cell-mediated immunity?

B-lymphocytes
T-lymphocytes
Macrophages
Neutrophils
2

T-lymphocytes play a key role in cell-mediated immunity by recognizing and attacking infected or abnormal cells.

Which of the following statements about cancer cells is incorrect?

Cancer cells lose the ability to undergo controlled cell division.
Cancer cells exhibit metastasis.
Cancer cells always remain confined to their original location.
Cancer can be caused by genetic mutations.
3

Cancer cells can spread to other parts of the body through a process called metastasis.

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