Class XII · Biology practice

Human Health and Disease MCQs

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446 questions in this collection · Page 4 of 45

Question 31 of 446

📘 CLASS XII

Human Health And Disease

Recent widespread incidences of dengue and chikungunya in many parts of India are linked to which mosquito vector?

Widespread incidences of the vector-borne (*Aedes* mosquitoes) diseases like dengue and chikungunya have been noted.

Question 32 of 446

📘 CLASS XII

Human Health And Disease

The ability of the host to fight disease-causing organisms, conferred by the immune system, is called:

This overall ability of the host to fight the disease-causing organisms, conferred by the immune system is called immunity.

Question 33 of 446

📘 CLASS XII

Human Health And Disease

Innate immunity is characterized by being:

Innate immunity is non-specific type of defence, that is present at the time of birth.

Question 34 of 446

📘 CLASS XII

Human Health And Disease

Which component is an example of a physical barrier in innate immunity?

Skin on our body is the main physical barrier preventing entry of micro-organisms.

Question 35 of 446

📘 CLASS XII

Human Health And Disease

Which of the following secretions acts as a physiological barrier preventing microbial growth?

Acid in the stomach, saliva in the mouth, tears from eyes—all prevent microbial growth.

Question 36 of 446

📘 CLASS XII

Human Health And Disease

Which types of cells are classified as cellular barriers capable of phagocytosis?

Certain types of leukocytes like PMNL-neutrophils, monocytes and natural killer cells can phagocytose and destroy microbes.

Question 37 of 446

📘 CLASS XII

Human Health And Disease

Virus-infected cells secrete proteins called interferons. These belong to which barrier category?

Virus-infected cells secrete proteins called interferons which are categorized as cytokine barriers.

Question 38 of 446

📘 CLASS XII

Human Health And Disease

The second, highly intensified response elicited upon subsequent encounter with the same pathogen is called:

Subsequent encounter with the same pathogen elicits a highly intensified secondary or anamnestic response.

Question 39 of 446

📘 CLASS XII

Human Health And Disease

The primary and secondary immune responses are carried out with the help of two special types of lymphocytes: T-lymphocytes and:

The responses are carried out with the help of B-lymphocytes and T-lymphocytes.

Question 40 of 446

📘 CLASS XII

Human Health And Disease

The proteins produced by B-lymphocytes in response to pathogens are called:

The B-lymphocytes produce an army of proteins called antibodies to fight pathogens.

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