Class XII · Biology practice

Human Health and Disease MCQs

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446 questions in this collection · Page 6 of 45

Question 51 of 446

📘 CLASS XII

Human Health And Disease

The exaggerated response of the immune system to certain antigens present in the environment (like pollen or mites) is called:

The exaggerated response of the immune system to certain antigens present in the environment is called allergy.

Question 52 of 446

📘 CLASS XII

Human Health And Disease

The substances that provoke an allergic immune response are called:

The substances to which such an immune response is produced are called allergens.

Question 53 of 446

📘 CLASS XII

Human Health And Disease

What type of antibodies are produced in response to allergens?

The antibodies produced to these (allergens) are of IgE type.

Question 54 of 446

📘 CLASS XII

Human Health And Disease

Allergy symptoms arise due to the release of chemicals like histamine and serotonin from which type of cells?

Allergy is due to the release of chemicals like histamine and serotonin from the mast cells.

Question 55 of 446

📘 CLASS XII

Human Health And Disease

Which common auto-immune disease is mentioned in the sources?

Rheumatoid arthritis which affects many people in our society is an auto-immune disease.

Question 56 of 446

📘 CLASS XII

Human Health And Disease

The human immune system recognizes foreign antigens, responds to them, and performs which critical action characteristic of acquired immunity?

The immune system is unique in the sense that it recognises foreign antigens, responds to these and remembers them.

Question 57 of 446

📘 CLASS XII

Human Health And Disease

Which of the following is considered a primary lymphoid organ?

The primary lymphoid organs are bone marrow and thymus.

Question 58 of 446

📘 CLASS XII

Human Health And Disease

What is the function of primary lymphoid organs (bone marrow and thymus)?

Primary lymphoid organs are where immature lymphocytes differentiate into antigen-sensitive lymphocytes.

Question 59 of 446

📘 CLASS XII

Human Health And Disease

Which of the following is NOT a secondary lymphoid organ?

Thymus is a primary lymphoid organ; spleen, lymph nodes, tonsils, Peyer’s patches, and appendix are secondary lymphoid organs.

Question 60 of 446

📘 CLASS XII

Human Health And Disease

The spleen acts as a filter of the blood by trapping micro-organisms and also has a large reservoir of:

Spleen acts as a filter of the blood and also has a large reservoir of erythrocytes.

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