Q170. Why must vitamins A and K be maintained adequately in broiler poultry feed?
[RRB JE CBT-I, 20 Feb 2026, Shift 1]
- (a) Greater cold tolerance
- (b) Proper nourishment for growth and development
- (c) Protection from all parasites
- (d) Smaller egg size
Answer: (b) Proper nourishment for growth and development
Explanation: Growing broilers require balanced dietary vitamins as well as energy and protein. Vitamin A supports epithelial health and development, whereas vitamin K is required for normal coagulation, contributing to proper nutrition and healthy growth.
Q169. What food-related concerns were highlighted in the World Food Safety Day 2025 awareness campaign?
[RRB Group D, 5 Feb 2026, Shift 1]
- (a) Excess iron and protein
- (b) High fibre and calcium
- (c) Low vitamin C and zinc
- (d) Hidden sugars, fats and oils
Answer: (d) Hidden sugars, fats and oils
Explanation: The public-health awareness campaign emphasised less visible sources of sugar, fat and oil in everyday diets. Excess intake can contribute to unhealthy nutrition patterns, even when such ingredients are not obvious from the appearance of foods.
Q168. Which vitamin group is kept at high levels in chicken feed for appropriate growth?
[RRB Group D, 17 Dec 2025, Shift 2]
- (a) Vitamins A, D and E
- (b) Vitamins B9 and B12
- (c) Vitamins C and K
- (d) Vitamins B1, B2 and B3
Answer: (a) Vitamins A, D and E
Explanation: Poultry feed is balanced to support fast growth, immunity and healthy skeletal development. Vitamins A, D and E contribute to epithelial function, calcium balance and antioxidant protection respectively. The question concerns the listed supplement combination.
Q167. Among D, B12, K and C, which listed vitamins are water-soluble?
(1) D
(2) B12
(3) K
(4) C
[RRB NTPC UG CBT-I, 21 Aug 2025, Shift 2]
- (a) Only 2 and 3
- (b) Only 1 and 2
- (c) Only 1, 2 and 3
- (d) Only 2 and 4
Answer: (d) Only 2 and 4
Explanation: Cobalamin (B12) and ascorbic acid (C) are water-soluble. Vitamins D and K belong to the fat-soluble group. Unlike most water-soluble vitamins, B12 can be stored in appreciable amounts in the liver.
Q166. Which of these are fat-soluble: (1) vitamin A, (2) B6, (3) C, (4) D?
[RRB NTPC UG CBT-I, 18 Aug 2025, Shift 1]
- (a) Only 1 and 2
- (b) Only 1 and 4
- (c) Only 1, 2 and 3
- (d) Only 2 and 3
Answer: (b) Only 1 and 4
Explanation: Vitamins A and D dissolve in dietary fat and can be stored in body tissues. Pyridoxine (B6) and vitamin C are water-soluble instead. This distinction influences absorption, storage and the risk of toxicity.
Q165. Which of the following is classified as a micronutrient?
[RRB NTPC UG CBT-I, 8 Aug 2025, Shift 1]
- (a) Fats
- (b) Vitamins
- (c) Proteins
- (d) Carbohydrates
Answer: (b) Vitamins
Explanation: Vitamins are needed in small quantities to regulate essential biochemical processes. Fats, carbohydrates and proteins are macronutrients because they are required in comparatively large amounts and provide energy or building material for tissues.
Q164. Which vitamin, function and deficiency combination is correctly matched?
[SSC Selection Post Higher Secondary, 31 Jul 2025, Shift 2]
- (a) A — calcium absorption — scurvy
- (b) D — visual pigment — pellagra
- (c) B12 — nerve and RBC function — pernicious anaemia
- (d) C — blood clotting — night blindness
Answer: (c) B12 — nerve and RBC function — pernicious anaemia
Explanation: Vitamin B12 is needed for DNA synthesis, red-cell maturation and neurological maintenance. Its deficiency can cause megaloblastic anaemia and neurological injury; pernicious anaemia is specifically caused by impaired B12 absorption due to lack of intrinsic factor.
Q163. Which vitamin deficiency commonly causes difficulty seeing in dim light?
[RRB NTPC Graduate CBT-I, 17 Jun 2025, Shift 1]
- (a) Vitamin A
- (b) Vitamin B12
- (c) Vitamin D
- (d) Vitamin C
Answer: (a) Vitamin A
Explanation: Vitamin A is necessary for retinal photopigments involved in vision at low light levels. Long-standing deficiency can cause night blindness and, when severe, dryness of the conjunctiva and cornea called xerophthalmia.
Q162. A blocked bile duct most directly raises the risk of deficiency of which listed vitamin?
[RRB NTPC Graduate CBT-I, 12 Jun 2025, Shift 3]
- (a) Vitamin A
- (b) Vitamin C
- (c) Vitamin B1
- (d) Vitamin B12
Answer: (a) Vitamin A
Explanation: Bile helps emulsify dietary fats so the intestine can absorb fat-soluble vitamins. Vitamin A belongs to the A, D, E and K group. Obstructed bile flow therefore interferes with its absorption more than with water-soluble options.
Q161. By what other name is vitamin B1 known?
[NDA-I General Ability Test, 13 Apr 2025]
- (a) Riboflavin
- (b) Thiamin
- (c) Retinol
- (d) Tocopherol
Answer: (b) Thiamin
Explanation: Thiamin is vitamin B1, a water-soluble nutrient needed in carbohydrate metabolism and normal nerve function. Riboflavin is B2; retinol is vitamin A; tocopherol is vitamin E. Inadequate thiamin can cause beriberi.