Free Human Body and Health MCQs with Answers

141. Deficiency of vitamin E in the human body causes __________?

• A. Muscle weakness and vision problem
• B. Bone problem
• C. Rickets
• D. Osteoporosis

Explanation: Vitamin E protects cell membranes and nerve tissue, so severe deficiency may cause muscle weakness and vision or nerve problems. Rickets and osteoporosis are chiefly linked to vitamin D and mineral imbalance.

142. Deficiency of vitamin "D" in human body can causes____?

• A. Gum disease
• B. Skin problem
• C. osteoporosis and fractures
• D. Eye-sighted weakness

Explanation: Vitamin D is needed to absorb calcium and maintain mineralised bones, so deficiency weakens bones and increases the risk of fractures and osteoporosis. In children, the classic deficiency disease is rickets.

143. Dr. James Watson discovered the structure of DNA in __________?

• A. 1953
• B. 1955
• C. 1957
• D. 1857Physics

Explanation: Watson and Crick proposed the double-helix structure of DNA in 1953, using crucial evidence including Rosalind Franklin's X-ray diffraction work. The question says Watson alone, but the year and intended option are clear.

144. How Many Brains Does an Octopus Have?

• A. 7
• B. 8
• C. 9
• D. 6

Explanation: An octopus is commonly described as having nine brains: one central brain and eight major nerve centres associated with its arms. The arm nerve centres help each arm process information and coordinate movement.

145. Outer layer of the human skin is called __________?

• A. Hypodermis
• B. Dermis
• C. Hemidermis
• D. Epidermis

Explanation: The epidermis is the outer protective layer of skin, while the dermis lies beneath it and contains blood vessels, nerves and glands. The hypodermis is deeper still and contains much fatty tissue.

146. There are almost _______of nephrons in the each kidney in human body?

• A. 5 million
• B. 3 million
• C. 1 million
• D. 10 million

Explanation: Each human kidney contains approximately one million nephrons, its microscopic filtration units. Their glomeruli filter blood and their tubules adjust the filtrate to form urine.

147. Which of the following is the strongest & longest bone of human body?

• A. Stapes
• B. Femur
• C. Tibia
• D. None of the above

Explanation: The femur is the longest and strongest bone in the human body, extending from the hip to the knee. The stapes is the smallest bone, while the tibia is a major lower-leg bone but not the longest.

148. Which of the following is the largest gland of the Human body _________?

• A. Lungs
• B. Liver
• C. Skin
• D. Gall Bladder

Explanation: The liver is the largest gland and the largest internal organ in the human body. The skin is the largest organ overall, but it is not usually classified as the largest gland.

149. Water soluble Vitamins are _________?

• A. A & D vitamins
• B. B & C vitamins
• C. A & K vitamins
• D. B & K vitamins

Explanation: Vitamins B and C dissolve in water and are not stored extensively in the body, so regular dietary intake is important. Vitamins A and D are fat-soluble and can accumulate in body tissues.

150. Vitamins A,D,E & _______ are fat soluble .

• A. Vitamin B
• B. Vitamin C
• C. Vitamin K
• D. AOT

Explanation: The fat-soluble vitamins are A, D, E and K, remembered by the phrase ADEK. Vitamins B and C are water-soluble.