Q.1 Which vitamin is also known as ascorbic acid?
Vitamin A
Vitamin C
Vitamin D
Vitamin K
Explanation - Ascorbic acid is the chemical name of Vitamin C, essential for collagen synthesis and antioxidant activity.
Correct answer is: Vitamin C
Q.2 Which vitamin deficiency leads to night blindness?
Vitamin B12
Vitamin A
Vitamin D
Vitamin K
Explanation - Vitamin A is essential for the formation of rhodopsin in the retina; its deficiency causes night blindness.
Correct answer is: Vitamin A
Q.3 Which vitamin acts as a coenzyme in transamination reactions?
Vitamin B1
Vitamin B2
Vitamin B6
Vitamin B12
Explanation - Vitamin B6 (pyridoxal phosphate) functions as a coenzyme in transamination and decarboxylation reactions.
Correct answer is: Vitamin B6
Q.4 Pellagra is caused by deficiency of which vitamin?
Vitamin B2
Vitamin B3
Vitamin B6
Vitamin C
Explanation - Vitamin B3 (niacin) deficiency causes pellagra, characterized by dermatitis, diarrhea, and dementia.
Correct answer is: Vitamin B3
Q.5 Which vitamin requires intrinsic factor for absorption?
Vitamin B6
Vitamin B12
Vitamin C
Vitamin D
Explanation - Vitamin B12 absorption in the ileum requires intrinsic factor secreted by the stomach’s parietal cells.
Correct answer is: Vitamin B12
Q.6 Deficiency of Vitamin D in children causes which disease?
Scurvy
Rickets
Pellagra
Beri-beri
Explanation - Vitamin D deficiency leads to poor bone mineralization in children, resulting in rickets.
Correct answer is: Rickets
Q.7 Which fat-soluble vitamin is essential for blood clotting?
Vitamin A
Vitamin D
Vitamin E
Vitamin K
Explanation - Vitamin K is needed for synthesis of clotting factors II, VII, IX, and X.
Correct answer is: Vitamin K
Q.8 Which vitamin functions as an antioxidant protecting cell membranes?
Vitamin A
Vitamin D
Vitamin E
Vitamin K
Explanation - Vitamin E (tocopherol) protects membranes from oxidative damage by scavenging free radicals.
Correct answer is: Vitamin E
Q.9 Beri-beri is caused by deficiency of which vitamin?
Vitamin B1
Vitamin B2
Vitamin B3
Vitamin B6
Explanation - Vitamin B1 (thiamine) deficiency causes beri-beri due to impaired carbohydrate metabolism.
Correct answer is: Vitamin B1
Q.10 Which vitamin is essential for collagen synthesis?
Vitamin A
Vitamin B12
Vitamin C
Vitamin K
Explanation - Vitamin C is required for hydroxylation of proline and lysine residues in collagen synthesis.
Correct answer is: Vitamin C
Q.11 Which vitamin acts as a coenzyme in oxidative decarboxylation of pyruvate?
Vitamin B1
Vitamin B2
Vitamin B6
Vitamin B12
Explanation - Vitamin B1 in the form of thiamine pyrophosphate is essential in the pyruvate dehydrogenase complex.
Correct answer is: Vitamin B1
Q.12 Deficiency of which vitamin can lead to megaloblastic anemia?
Vitamin B6
Vitamin B9
Vitamin B12
Both B9 and B12
Explanation - Folate (B9) and Vitamin B12 are crucial for DNA synthesis; deficiency of either causes megaloblastic anemia.
Correct answer is: Both B9 and B12
Q.13 Which vitamin is also known as retinol?
Vitamin A
Vitamin B1
Vitamin C
Vitamin D
Explanation - Retinol is the active form of Vitamin A, essential for vision and epithelial health.
Correct answer is: Vitamin A
Q.14 Which vitamin serves as a cofactor for carboxylation reactions?
Vitamin B1
Vitamin B7
Vitamin B9
Vitamin C
Explanation - Vitamin B7 (biotin) acts as a coenzyme for carboxylases in gluconeogenesis and fatty acid synthesis.
Correct answer is: Vitamin B7
Q.15 Which vitamin is abundant in citrus fruits?
Vitamin A
Vitamin B2
Vitamin C
Vitamin D
Explanation - Citrus fruits like oranges and lemons are rich in Vitamin C.
Correct answer is: Vitamin C
Q.16 Which vitamin is also called riboflavin?
Vitamin B1
Vitamin B2
Vitamin B6
Vitamin B12
Explanation - Vitamin B2 is riboflavin, a component of FAD and FMN coenzymes.
Correct answer is: Vitamin B2
Q.17 Which vitamin deficiency is linked with neural tube defects?
Vitamin B6
Vitamin B9
Vitamin B12
Vitamin C
Explanation - Folic acid (B9) deficiency during pregnancy increases the risk of neural tube defects in newborns.
Correct answer is: Vitamin B9
Q.18 Which vitamin can be synthesized in the skin upon sunlight exposure?
Vitamin A
Vitamin C
Vitamin D
Vitamin E
Explanation - Ultraviolet light converts 7-dehydrocholesterol in the skin to Vitamin D3.
Correct answer is: Vitamin D
Q.19 Which vitamin deficiency causes scurvy?
Vitamin A
Vitamin B1
Vitamin C
Vitamin D
Explanation - Vitamin C deficiency causes scurvy, marked by gum bleeding, poor wound healing, and bone weakness.
Correct answer is: Vitamin C
Q.20 Which vitamin is essential for vision in dim light?
Vitamin A
Vitamin D
Vitamin E
Vitamin K
Explanation - Vitamin A is required for rhodopsin regeneration, enabling night vision.
Correct answer is: Vitamin A
Q.21 Which vitamin is involved in one-carbon metabolism?
Vitamin B6
Vitamin B9
Vitamin B12
Both B9 and B12
Explanation - Folate (B9) and B12 are essential for transferring one-carbon units in DNA synthesis.
Correct answer is: Both B9 and B12
Q.22 Which vitamin prevents oxidative damage to polyunsaturated fatty acids?
Vitamin A
Vitamin D
Vitamin E
Vitamin K
Explanation - Vitamin E is a lipid-soluble antioxidant that protects PUFA in membranes.
Correct answer is: Vitamin E
Q.23 Which vitamin acts as a coenzyme in fatty acid oxidation?
Vitamin B2
Vitamin B3
Vitamin B5
Vitamin B7
Explanation - Vitamin B2 (riboflavin) is part of FAD, crucial for beta-oxidation of fatty acids.
Correct answer is: Vitamin B2
Q.24 Which vitamin is required for synthesis of coenzyme A?
Vitamin B2
Vitamin B3
Vitamin B5
Vitamin B7
Explanation - Vitamin B5 (pantothenic acid) is a precursor for coenzyme A synthesis.
Correct answer is: Vitamin B5
Q.25 Which vitamin deficiency is common in alcoholics leading to Wernicke-Korsakoff syndrome?
Vitamin B1
Vitamin B2
Vitamin B6
Vitamin B12
Explanation - Thiamine deficiency is frequent in alcoholics, leading to Wernicke-Korsakoff syndrome affecting memory and coordination.
Correct answer is: Vitamin B1