Free Human Body and Health MCQs with Answers

341. Which two organs glands are affected by malaria?

• A. Lungs and heart
• B. Spleen and liver
• C. Kidneys and lungs
• D. Heart and brain

Explanation: Malaria parasites first develop in the liver and later infect red blood cells, while the spleen helps filter affected cells and may become enlarged. Thus, the liver and spleen are the characteristic organs involved among these choices.

342. Vector of Kala-azar disease is___________?

• A. Sandfly
• B. Dragonfly
• C. Mosquito
• D. Housefly

Explanation: Kala-azar, or visceral leishmaniasis, is transmitted by the bite of an infected female sandfly. Mosquitoes transmit diseases such as malaria and dengue, not kala-azar.

343. Which of the following is not a contagious disease?

• A. Hysteria
• B. Measles
• C. Typhoid
• D. Influenza

Explanation: Hysteria is not an infectious disease and therefore does not spread from person to person. Measles, influenza, and typhoid are communicable diseases, although typhoid commonly spreads through contaminated food or water.

344. Which of the following is nutritional deficiency disease?

• A. Albinism
• B. Cirrhosis
• C. Rabies
• D. Pellagra

Explanation: Pellagra results mainly from niacin, or vitamin B3, deficiency and is classically associated with dermatitis, diarrhoea, and dementia. Albinism is genetic, rabies is infectious, and cirrhosis is liver damage with multiple possible causes.

345. Vitamin B3 is also known as__________?

• A. Thiamine
• B. Riboflavin
• C. Niacin
• D. Retinol

Explanation: Vitamin B3 is niacin, which is needed for energy metabolism and healthy skin and nerves. Thiamine is B1, riboflavin is B2, and retinol is vitamin A.

346. Vitamin B2 is also called as__________?

• A. Riboflavin
• B. Thiamine
• C. Ascorbic Acid
• D. Niacin

Explanation: Vitamin B2 is riboflavin, a coenzyme vitamin involved in energy release and tissue maintenance. Thiamine is B1, niacin is B3, and ascorbic acid is vitamin C.

347. Vitamin B1 is also known as____________?

• A. Riboflavin
• B. Retinol
• C. Thiamine
• D. Niacin

Explanation: Vitamin B1 is thiamine, which is important for carbohydrate metabolism and normal nerve function. Riboflavin is B2, niacin is B3, and retinol is vitamin A.

348. A branch of medicine dealing with eyes and related diseases is called_________?

• A. Opthalmology
• B. Obstetrics
• C. Physiology
• D. Haematology

Explanation: Ophthalmology is the medical specialty concerned with the eyes and their diseases. Obstetrics deals with pregnancy and childbirth, while physiology studies normal body functions.

349. Disease beri beri is because of___________?

• A. Lack of green vegetables in diet
• B. Use of milled rice
• C. Deficiency of calcium in bones
• D. Poor use of citrus fruits

Explanation: Beriberi results from severe vitamin B1, or thiamine, deficiency, which commonly occurs when polished or milled rice forms the main diet. Citrus deficiency causes scurvy, not beriberi.

350. Insects responsible for transmitting diseases are called___________?

• A. Drones
• B. Vectors
• C. Hybirds
• D. None of these

Explanation: A vector is an organism that transmits a disease-causing agent between hosts, such as a mosquito transmitting malaria parasites. The term is broader than insects, although many important vectors are insects.