NUTRITION PRACTICE EXAMS QUESTIONS WITH CORRECT VERIFIED ANSWERS

NUTRITION EXAM PRACTICE-QUESTION AND COLLECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2025/2026 Q&A |INSTANT
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1. Which of the following nutrients is essential for collagen synthesis?
A. Vitamin A
B. Vitamin C
C. Iron
D. Zinc

*Correct answer: B. Vitamin C — Vitamin C acts as a cofactor for prolyl and lysyl hydroxylase,
enzymes crucial for collagen formation.

2. What is the primary function of dietary fiber?
A. Provide energy
B. Promote gastrointestinal motility
C. Synthesize proteins
D. Absorb fat-soluble vitamins

*Correct answer: B. Promote gastrointestinal motility — Fiber adds bulk to stool and helps
prevent constipation.

3. Which vitamin is fat-soluble?
A. Vitamin B6
B. Vitamin C
C. Vitamin D
D. Vitamin B12

*Correct answer: C. Vitamin D — Vitamins A, D, E, and K are fat-soluble, stored in the liver
and adipose tissue.

4. Which macronutrient provides the most energy per gram?
A. Carbohydrate
B. Protein
C. Fat
D. Alcohol

*Correct answer: C. Fat — Fat provides 9 kcal/g, while carbohydrates and proteins provide 4
kcal/g.

5. Which mineral is critical for thyroid hormone production?
A. Calcium
B. Iodine

,C. Magnesium
D. Potassium

*Correct answer: B. Iodine — Iodine is required for the synthesis of thyroxine (T4) and
triiodothyronine (T3).

6. A deficiency of which vitamin causes rickets in children?
A. Vitamin D
B. Vitamin B12
C. Vitamin K
D. Vitamin C

*Correct answer: A. Vitamin D — Vitamin D deficiency leads to impaired calcium and
phosphorus metabolism, resulting in weak bones.

7. What is the main role of iron in the body?
A. Energy production
B. Oxygen transport
C. Hormone synthesis
D. Electrolyte balance

*Correct answer: B. Oxygen transport — Iron is a key component of hemoglobin and myoglobin.

8. Which of the following is a water-soluble vitamin?
A. Vitamin A
B. Vitamin E
C. Vitamin B6
D. Vitamin D

*Correct answer: C. Vitamin B6 — B-complex vitamins and vitamin C are water-soluble and not
stored extensively in the body.

9. Which nutrient deficiency is associated with beriberi?
A. Niacin
B. Thiamine
C. Riboflavin
D. Folate

*Correct answer: B. Thiamine — Thiamine (Vitamin B1) deficiency causes beriberi, affecting the
cardiovascular and nervous systems.

10. Which macronutrient is primarily responsible for tissue repair and growth?
A. Carbohydrates
B. Protein
C. Fat
D. Water

, *Correct answer: B. Protein — Proteins provide amino acids necessary for cell and tissue
synthesis.

11. Which nutrient is important for vision, especially night vision?
A. Vitamin D
B. Vitamin A
C. Vitamin E
D. Vitamin K

*Correct answer: B. Vitamin A — Vitamin A is a component of rhodopsin in the retina.

12. What is the main source of energy during prolonged fasting?
A. Glucose
B. Fatty acids
C. Protein
D. Glycogen

*Correct answer: B. Fatty acids — During prolonged fasting, the body mobilizes fat stores to
produce energy.

13. Excess intake of which vitamin can lead to hypercalcemia?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin K

*Correct answer: B. Vitamin D — Vitamin D increases calcium absorption from the gut, leading
to hypercalcemia if excessive.

14. Which nutrient deficiency causes scurvy?
A. Vitamin C
B. Vitamin B12
C. Iron
D. Vitamin D

*Correct answer: A. Vitamin C — Vitamin C deficiency impairs collagen synthesis, causing
bleeding gums and poor wound healing.

15. Which lipid type is considered heart-healthy?
A. Trans fats
B. Saturated fats
C. Monounsaturated fats
D. Hydrogenated oils

*Correct answer: C. Monounsaturated fats — Found in olive oil and avocado, they improve lipid
profiles and reduce cardiovascular risk.