Free Human Body and Health MCQs with Answers

311. Which Part of Human Eye can be donated?

• A. Conjunctiva
• B. Iris
• C. Pupil
• D. Cornea

Explanation: The cornea is the transparent front covering of the eye and can be donated for corneal transplantation. The iris, pupil and conjunctiva are not the standard transplantable eye tissue referred to here.

312. How many milky teeth or primary teeth does a human have?

• A. 33
• B. 20
• C. 15
• D. 32

Explanation: Children normally have 20 primary teeth, also called milk or deciduous teeth. They are later replaced by the permanent dentition, which normally contains 32 teeth.

313. ___________ is a mammal who fly?

• A. Ostrich
• B. Bat
• C. Peacock
• D. None of these

Explanation: A bat is a mammal because it has hair and nurses its young with milk, although it can fly. Ostrich and peacock are birds, not mammals.

314. Vitamin C is essential for___________?

• A. Appetite
• B. Growth & repairing of tissues
• C. Muscles
• D. Brain

Explanation: Vitamin C is needed for collagen formation, which supports the growth and repair of skin, blood vessels and other tissues. Severe deficiency causes scurvy and poor wound healing.

315. Human eye is how many Megapixels?

• A. 1080 MP
• B. 720 MP
• C. 576 MP
• D. 570 MP

Explanation: The human eye is often estimated to have a resolving capacity of about 576 megapixels, although comparing an eye directly with a camera sensor is only an approximation. This estimate refers to visual detail across the field of view, not a literal digital image.

316. Medium sized kidney stones are removed by__________?

• A. Dialysis
• B. Lithotripsy
• C. Excretion
• D. Laser

Explanation: Lithotripsy uses focused shock waves to break a medium-sized kidney stone into smaller pieces that can pass through the urinary tract. Dialysis treats kidney failure, not stones.

317. Accumulation of salts in kidneys results in_________?

• A. Diabetes
• B. Hypertension
• C. Cancer
• D. Kidney Stone

Explanation: When mineral salts crystallise and accumulate in the kidneys, they can form kidney stones. Diabetes and hypertension are different disorders and are not the direct result named here.

318. The apart of neuron which receives message are__________?

• A. Cell Bodies
• B. Axons
• C. Nuclei
• D. Dendrites

Explanation: Dendrites are branched extensions that receive signals from other neurons or receptors and carry them toward the cell body. Axons usually transmit signals away from the cell body.

319. Sensory neurons carry message towards ?

• A. Muscle
• B. Muscles and Glands
• C. Sense and Organs
• D. Brain and Spinal Cord Science

Explanation: Sensory neurons carry impulses from sense receptors toward the central nervous system, consisting of the brain and spinal cord. Motor neurons carry commands in the opposite direction to muscles or glands.

320. What is the percentage of water present in our brain?

• A. 85%
• B. 95%
• C. 97%
• D. 73%Preparing For College Admissions Tests

Explanation: The brain is composed of roughly 73% water, although the exact percentage varies with the source and how it is measured. The much higher values of 85% to 97% are common overestimates.