Free Human Body and Health MCQs with Answers

91. The good sources of iodine are_______?

• A. green leafy vegetables
• B. seeds
• C. fresh vegetables and fruits
• D. sea foods

Explanation: Seafood, particularly marine fish and seaweed, is rich in iodine because marine organisms concentrate this element. Iodine is needed to make thyroid hormones.

92. For proper formation of teeth, __________ is essential?

• A. iodine
• B. copper
• C. fluorine
• D. iron

Explanation: Fluoride helps strengthen tooth enamel and makes it more resistant to acid attack and decay. The option says fluorine, but in dental health the chemically active form is fluoride.

93. Deficiency of __________ causes loss of appetite and poor growth?

• A. zinc
• B. iodine
• C. copper
• D. iron

Explanation: Zinc is needed for normal growth, appetite and tissue repair, so deficiency commonly causes poor growth and loss of appetite. Iodine mainly affects thyroid function, while iron deficiency chiefly causes anaemia.

94. Carrot is good source of Vitamin _______?

• A. Vitamin A
• B. Vitamin B
• C. Vitamin C
• D. Vitamin D

Explanation: Carrots are rich in beta-carotene, which the body converts into vitamin A. Vitamin A supports vision, healthy skin and immunity.

95. Digestion of food is completed in the __________?

• A. small intestine
• B. large intestine
• C. stomach
• D. Liver

Explanation: The small intestine completes most chemical digestion through enzymes from the intestine, pancreas and bile from the liver. It also absorbs most digested nutrients.

96. Biosensor is used to measure?

• A. Blood glucose level
• B. The body pH value
• C. Amount of hemoglobin
• D. Salinity in Urine

Explanation: The best-known medical use of a biosensor is measuring blood glucose, as in a glucometer. It combines a biological recognition element with a device that produces a measurable signal.

97. Urine is produced in __________?

• A. Kidneys
• B. Lungs
• C. Large intestine
• D. Liver

Explanation: The kidneys filter blood and process the filtrate into urine through microscopic units called nephrons. The lungs remove carbon dioxide and water vapour, but they do not produce urine.

98. The fluid part of blood is known as __________?

• A. plasma
• B. platelets
• C. blood cells
• D. None of these

Explanation: Plasma is the pale liquid portion of blood in which blood cells and platelets are suspended. It also transports nutrients, hormones, wastes and proteins throughout the body.

99. Each day human body breathe in __________ liters of air.

• A. 5,000 to 10,000
• B. 10,000 to 15,000
• C. 15,000 to 20,000
• D. 20,000 to 25,000Exploring Online Chemistry Courses

Explanation: An average adult moves roughly 10,000 to 15,000 litres of air through the lungs per day at ordinary activity levels. The exact amount changes with breathing rate, body size and exercise.

100. Deficiency of Vitamin-D results in __________?

• A. night blindness
• B. rickets
• C. scurvy
• D. hair fall

Explanation: Vitamin D is needed for proper absorption and use of calcium and phosphate in bone formation. Its deficiency causes rickets in children, producing weak and deformed bones; night blindness results from vitamin A deficiency.