Vitamins and minerals constitute organic and inorganic micronutrients required in trace quantities for enzymatic catalysis, cellular homeostasis, and structural integrity. Biochemically, vitamins divide into fat-soluble vitamins (A, D, E, and K), stored in adipose tissue and the liver, and water-soluble vitamins (B-complex group and Vitamin C), which require regular dietary replenishment because excess quantities are excreted renally. Vitamin A (retinol) forms retinal pigments; its deficiency causes nyctalopia (night blindness) and xerophthalmia. The Vitamin B complex comprises coenzymes: B1 (thiamine) deficiency causes beriberi; B2 (riboflavin) deficiency produces cheilosis; B3 (niacin) deficiency leads to pellagra; B9 (folic acid) and B12 (cyanocobalamin) deficiencies cause megaloblastic and pernicious anemia. Vitamin C (ascorbic acid) enables collagen synthesis and antioxidant reduction; deficiency induces scurvy. Vitamin D (calciferol) regulates calcium absorption; deficiency produces rickets in children and osteomalacia in adults. Vitamin K (phylloquinone) synthesizes prothrombin, indispensable for blood clotting cascades. Essential minerals include iron for hemoglobin synthesis (deficiency causes microcytic anemia), iodine for thyroid hormone production (deficiency causes goiter), and calcium and phosphorus for bone mineralization.
High-yield conceptual summaries for competitive exams and rapid revision.
Vitamins A, D, E, and K are fat-soluble, whereas Vitamin C and all B-complex vitamins are water-soluble.
Vitamin B12 (cyanocobalamin) contains the trace metal cobalt and is essential for red blood cell maturation and nervous function.
Deficiency of Vitamin D causes rickets in growing children and osteomalacia (bone softening) in mature adults.
Vitamin C (ascorbic acid) is heat-labile and required for collagen synthesis, wound healing, and non-heme iron absorption.
Iodine deficiency impairs thyroxine (T4) synthesis, leading to compensatory enlargement of the thyroid gland termed endemic goitre.
Showing 25 Curated Questions140 Total in Bank
1ID: GK-BODY-00472
easyVitamins Nutrients
Deficiency of which essential water-soluble vitamin is the primary cause of scurvy, characterized by bleeding gums and poor wound healing?
Verified Explanation
Vitamin C (ascorbic acid) is an essential cofactor for prolyl and lysyl hydroxylases required for stable collagen synthesis; its deficiency leads to scurvy.
2ID: GK-BODY-00478
easyVitamins Nutrients
Which fat-soluble vitamin is essential for synthesizing clotting factors (Prothrombin, Factors VII, IX, and X) in the liver?
Verified Explanation
Vitamin K is a required cofactor for gamma-glutamyl carboxylase, which carboxylates glutamic acid residues in clotting factors II (prothrombin), VII, IX, and X, enabling normal blood coagulation.
3ID: GK-BODY-00490
easyVitamins Nutrients
Deficiency of which vitamin causes rickets in children and osteomalacia in adults due to impaired calcium absorption?
Verified Explanation
Vitamin D (cholecalciferol/ergocalciferol) is converted in the liver and kidneys to its active form, calcitriol, which stimulates intestinal calcium and phosphate absorption; its deficiency leads to weak, unmineralized bones (rickets).
4ID: GK-BODY-00512
hardVitamins Nutrients
Absorption of Vitamin B12 (Cobalamin) in the terminal ileum requires binding to which glycoprotein secreted by gastric parietal cells?
Verified Explanation
Gastric parietal cells secrete Intrinsic Factor, which complexes with dietary cobalamin (vitamin B12). The IF-B12 complex binds cubilin receptors in the terminal ileum for endocytosis; autoimmune destruction of parietal cells causes pernicious anemia.
5ID: GK-BODY-00524
hardVitamins Nutrients
What is the biochemical role of Vitamin B6 (Pyridoxal Phosphate / PLP) in human intermediary amino acid metabolism?
Verified Explanation
Pyridoxal phosphate (PLP), the active form of vitamin B6, forms a Schiff base intermediate with amino groups, serving as an obligatory coenzyme in transamination, decarboxylation, and racemization reactions in amino acid metabolism.
6ID: GK-HLTH-00052
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Deficiency of Vitamin A (retinol) in young children primarily leads to which clinical ocular condition?
Verified Explanation
Vitamin A is essential for the synthesis of rhodopsin (the visual pigment in retinal rod cells). Severe deficiency causes night blindness (inability to see in dim light), Bitot's spots, corneal xerosis, and eventually irreversible blindness (keratomalacia).
7ID: GK-HLTH-00054
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Which fat-soluble vitamin synthesized in the human skin upon exposure to solar UVB radiation is essential for intestinal calcium absorption and bone mineralization?
Verified Explanation
Vitamin D3 (cholecalciferol) is synthesized photosynthetically in skin cells from 7-dehydrocholesterol during sunlight exposure. It is hydroxylated in the liver and kidneys to calcitriol, which regulates calcium homeostasis; deficiency causes rickets in children and osteomalacia in adults.
8ID: GK-HLTH-00055
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Severe deficiency of Vitamin C (ascorbic acid) causes which classic nutritional deficiency disorder characterized by spongy bleeding gums, skin petechiae, and delayed wound healing?
Verified Explanation
Vitamin C is an essential cofactor for prolyl and lysyl hydroxylase enzymes necessary for collagen biosynthesis. Without Vitamin C, defective collagen synthesis leads to blood vessel fragility, gum bleeding, loose teeth, and poor wound healing (scurvy).
9ID: GK-HLTH-00111
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Severe chronic dietary deficiency of Vitamin B1 (Thiamine) leads to which classic nutritional deficiency disease affecting the cardiovascular or peripheral nervous systems?
Verified Explanation
Thiamine (Vitamin B1) deficiency causes Beriberi, which manifests as 'Wet Beriberi' (characterized by high-output congestive heart failure and edema) or 'Dry Beriberi' (characterized by symmetrical peripheral neuropathy and muscle wasting).
10ID: GK-HLTH-00112
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Deficiency of which B-complex vitamin is characteristically associated with painful angular stomatitis (cracks at the corners of the mouth), cheilosis, and magenta glossitis?
Verified Explanation
Ariboflavinosis (Vitamin B2 / Riboflavin deficiency) leads to classic mucocutaneous lesions including angular stomatitis, cheilosis (chapped vertical fissures of lips), glossitis (smooth purplish-red tongue), and nasolabial seborrheic dermatitis.
11ID: GK-HLTH-00114
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Which fat-soluble vitamin is physiologically required for the hepatic synthesis of blood coagulation factors II (Prothrombin), VII, IX, and X?
Verified Explanation
Vitamin K acts as an essential cofactor for the enzyme gamma-glutamyl carboxylase, which carboxylates glutamic acid residues in clotting factors II, VII, IX, and X in the liver, enabling them to bind calcium and execute blood clotting.
12ID: GK-HLTH-00129
hardICMR Guidelines, POSHAN Abhiyaan & Nutrition
What physiological glycoprotein secreted by the parietal cells of the gastric stomach mucosa is strictly required for the ileal absorption of dietary Vitamin B12?
Verified Explanation
Gastric Intrinsic Factor (GIF) binds Vitamin B12 in the upper small intestine after it is released from R-binders. The B12-IF complex resists enzymatic digestion and is absorbed via receptor-mediated endocytosis by cubilin receptors in the terminal ileum. Autoimmune destruction of parietal cells results in Pernicious Anaemia.
13ID: GK-HLTH-00172
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Which classic skeletal disorder in infants and young children, characterized by soft pliable bones, bow legs, and rachitic rosary, is caused by severe deficiency of Vitamin D and calcium?
Verified Explanation
Rickets is a childhood metabolic bone disease caused by unmineralized osteoid matrix due to severe Vitamin D and/or calcium deficiency, resulting in delayed fontanelle closure, swollen wrists, rachitic rosary, and bowing of legs upon weight bearing.
14ID: GK-HLTH-00173
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
What characteristic triangular, foamy, silvery-white elevated patches appearing on the bulbar conjunctiva are clinical diagnostic signs of Vitamin A deficiency in children?
Verified Explanation
Bitot's spots are distinct foamy, triangular lesions formed by keratinized epithelial debris on the conjunctiva, representing Stage X1B of Xerophthalmia caused by severe chronic dietary Vitamin A (retinol) deficiency.
15ID: GK-HLTH-00175
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Why is a single dose of Vitamin K1 (1 mg intramuscular) administered to all newborns immediately after birth across delivery facilities in India?
Verified Explanation
Newborns have sterile intestines lacking Vitamin K-producing bacteria and low placental transfer of the vitamin. Administering 1 mg Vitamin K1 at birth ensures prompt hepatic synthesis of clotting factors II, VII, IX, and X, preventing catastrophic intracranial and gastrointestinal hemorrhages.
Why is Vitamin B6 (Pyridoxine) routinely co-prescribed to patients undergoing anti-tuberculosis therapy with Isoniazid (INH)?
Verified Explanation
Isoniazid chemically binds to pyridoxal-5-phosphate and inhibits pyridoxine phosphokinase, causing functional Vitamin B6 depletion and severe peripheral neuropathy (numbness, paresthesias). Prophylactic pyridoxine (10–50 mg daily) neutralizes this toxicity.
17ID: GK-HLTH-00185
hardICMR Guidelines, POSHAN Abhiyaan & Nutrition
Which neurological syndrome, characterized by progressive demyelination of the dorsal (posterior) and lateral columns of the spinal cord causing ataxia and loss of vibration sense, is caused by chronic Vitamin B12 deficiency?
Verified Explanation
Vitamin B12 is essential for methylmalonyl-CoA mutase activity in myelin sheath maintenance. Chronic B12 deficiency causes abnormal fatty acid incorporation into neuronal lipids, resulting in Subacute Combined Degeneration (SCD) affecting dorsal columns and corticospinal tracts.
18ID: GK-HLTH-00189
hardICMR Guidelines, POSHAN Abhiyaan & Nutrition
At the molecular level, why does severe ascorbic acid (Vitamin C) deficiency lead to blood vessel fragility, spongy bleeding gums, and defective wound healing in Scurvy?
Verified Explanation
Ascorbic acid acts as an essential electron donor/reducing agent for prolyl hydroxylase and lysyl hydroxylase, which hydroxylate proline and lysine residues during collagen biosynthesis. Lack of Vitamin C produces unstable, under-hydroxylated tropocollagen that cannot form normal connective tissue triple helices.
19ID: GK-HLTH-00233
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Bitot's spots—dry, triangular, silvery foamy patches appearing on the bulbar conjunctiva of the eye—are a classic clinical sign of deficiency of which vitamin?
Verified Explanation
Bitot's spots are raised, triangular foamy patches of keratinized epithelial debris on the bulbar conjunctiva caused by Vitamin A deficiency. It is an early ocular manifestation of xerophthalmia, which if untreated progresses to keratomalacia and irreversible blindness.
20ID: GK-HLTH-00235
easyICMR Guidelines, POSHAN Abhiyaan & Nutrition
Pellagra, classically characterized by the '4 Ds' (Dermatitis, Diarrhea, Dementia, and Death), is caused by a dietary deficiency of which vitamin?
Verified Explanation
Pellagra is a systemic nutritional disorder caused by severe deficiency of Vitamin B3 (Niacin) or its amino acid precursor Tryptophan. It presents with symmetrical photosensitive dermatitis (Casal's necklace), gastrointestinal diarrhea, and progressive neuropsychiatric dementia.
Which nutritional deficiency disorder occurs predominantly in populations consuming diets based exclusively on machine-polished raw white rice lacking Vitamin B1 (Thiamine)?
Verified Explanation
Beriberi is caused by deficiency of Vitamin B1 (Thiamine), which is lost when the outer aleurone layer of rice is removed during heavy industrial polishing. It manifests as Dry Beriberi (peripheral neuropathy and muscle wasting) or Wet Beriberi (high-output congestive heart failure and peripheral edema).
22ID: GK-HLTH-00248
hardICMR Guidelines, POSHAN Abhiyaan & Nutrition
At the molecular level, why does Vitamin C (Ascorbic Acid) deficiency cause the clinical bleeding, spongy gums, and poor wound healing seen in Scurvy?
Verified Explanation
Ascorbic acid acts as an essential electron-donor cofactor for the enzymes prolyl hydroxylase and lysyl hydroxylase. Without Vitamin C, unhydroxylated pro-collagen peptide chains cannot form stable hydrogen bonds to assemble the collagen triple helix, weakening capillary walls and connective tissues.
23ID: GK-HLTH-00304
hardICMR Guidelines, POSHAN Abhiyaan & Nutrition
What is the recommended prophylactic dose of Vitamin A administered to infants at 9 months of age alongside the first dose of Measles-Rubella vaccine under the National Vitamin A Prophylaxis Programme?
Verified Explanation
Under the National Vitamin A Prophylaxis Programme, infants receive an initial dose of 100,000 IU (1 lakh IU / 1 ml) of Vitamin A orally at 9 months of age with MR-1. Subsequently, doses of 200,000 IU (2 ml) are administered bi-annually every 6 months until 5 years of age (total 9 doses). This prophylactic schedule eliminates nutritional blindness (xerophthalmia) and boosts childhood immunity.
Deficiency of Vitamin C (ascorbic acid), which impairs collagen synthesis in blood vessels and gums, leads to which classic nutritional deficiency disease?
Verified Explanation
Scurvy is caused by severe deficiency of Vitamin C (ascorbic acid). Because Vitamin C is essential for proline and lysine hydroxylation in collagen synthesis, its deficiency results in fragile capillaries, bleeding gums, skin petechiae, and delayed wound healing.
The classic clinical triad of 'Dermatitis, Diarrhea, and Dementia' (the 3 Ds) is pathognomonic of which vitamin deficiency disease historically observed in populations dependent on untreated maize diets?
Verified Explanation
Pellagra is caused by a severe deficiency of Vitamin B3 (Niacin) or its precursor amino acid tryptophan, presenting with the classic 3 Ds: photosensitive bilateral symmetrical dermatitis, persistent diarrhea, and progressive dementia.