Free Human Body and Health MCQs with Answers

271. Trachoma is the disease of the________ ?

• A. Brain
• B. Spinal cord
• C. Larynx
• D. Eye

Explanation: Trachoma is a contagious bacterial infection of the eye, especially the conjunctiva and cornea. Repeated infection can scar the eyelid and cause blindness.

272. The number of facial bones in a human body ________?

• A. 15
• B. 14
• C. 22
• D. 26Purchasing Educational Biology Kits

Explanation: The skull has 14 facial bones, including the paired maxillae, zygomatic bones and nasal bones, along with the unpaired mandible and others. The 22 total bones refers to the entire skull, not just the face.

273. Where would you find a Eustachian Tube?

• A. In the Brain
• B. In the Lung
• C. In the Ear
• D. In Stomach

Explanation: The Eustachian tube connects the middle ear with the back of the throat and helps equalise air pressure on both sides of the eardrum. It is therefore part of the ear, not the brain, lung or stomach.

274. Vitamin E reduces the requirement of _________ .

• A. Iron
• B. Zinc
• C. Selenium
• D. Magnesium

Explanation: Vitamin E and selenium work together as antioxidants, so adequate vitamin E can reduce the body’s requirement for selenium. The other listed minerals do not have this standard nutrient-sparing relationship.

275. Scurvy is caused due to the deficiency of ___________?

• A. Vitamin A
• B. Vitamin D
• C. Vitamin C
• D. None of these

Explanation: Vitamin C is needed for collagen formation and healthy connective tissue; its deficiency causes scurvy, with symptoms such as bleeding gums and poor wound healing. Vitamins A and D deficiencies cause different disorders.

276. Of the total number of genes inherited by a child:

• A. more are from the father
• B. more are from the mother
• C. there are an equal number from each parent
• D. there is never a constant number from the parents

Explanation: A child normally receives one set of chromosomes, and therefore roughly half of the nuclear genes, from each parent. This equal contribution is independent of whether the child is male or female, apart from special sex-linked details.

277. The Structure in a cell which contains the genes is called:

• A. Genetics
• B. Saliva
• C. Marrow
• D. Chromosome

Explanation: Genes are arranged on chromosomes, which are DNA-containing structures inside cells. Genetics is the study of heredity, not a structure, while saliva and marrow are body substances or tissues.

278. Exposure to sunlight helps a person improve his health because ________?

• A. Resistance power increases
• B. The infrared light kills bacteria in the body
• C. The ultraviolet rays convert skin oil into Vitamin D
• D. The pigment cells in the skin get stimulated and produce a healthy tan

Explanation: UVB radiation starts the production of vitamin D in the skin from a cholesterol-derived precursor, which supports bone health and calcium absorption. The option's reference to skin oil is an oversimplification, but it identifies the correct sunlight mechanism among the choices.

279. Which of the following in human body is involved in controlling blood sugar level?

• A. Pitutary glands
• B. Islets of Langerhans
• C. Hypothalamus
• D. Spleen

Explanation: The Islets of Langerhans in the pancreas contain beta cells that release insulin and alpha cells that release glucagon, together regulating blood glucose. The pituitary and hypothalamus control other endocrine functions, while the spleen does not regulate blood sugar directly.

280. The most important function of perspiration is?

• A. Get rid of body waste
• B. Regulate body temperature
• C. Regulate body waste
• D. Lubricate the skin

Explanation: Perspiration cools the body when sweat evaporates from the skin, carrying away heat. Waste removal is a minor function of sweat, not its main purpose.