Which vitamin is produced in human skin when exposed to sunlight?
Difficulty: Easy
About this MCQ
This Easy Everyday Science MCQ checks one syllabus fact. Candidates use it for NTS GAT General practice.
The question is: “Which vitamin is produced in human skin when exposed to sunlight?”
The accepted answer is C. Vitamin D. UVB radiation from sunlight converts 7-dehydrocholesterol in the skin to previtamin D3, which becomes vitamin D3. Vitamin D is essential for calcium absorption and bone health.
- A. Vitamin A
Why not A: Vitamin A is obtained from diet (e.g., carrots, liver), not synthesized via sunlight.
- B. Vitamin C
Why not B: Vitamin C comes from fruits and vegetables.
- C. Vitamin D ✓
- D. Vitamin K
Why not D: Vitamin K is obtained from diet and gut bacteria activity.
Correct answer
C. Vitamin D
Explanation
UVB radiation from sunlight converts 7-dehydrocholesterol in the skin to previtamin D3, which becomes vitamin D3. Vitamin D is essential for calcium absorption and bone health.
Source: Human physiology / nutrition science
Tags: Biology, Human Body
Relevant exams: NTS GAT General
Submitted by: MCQsHub Editorial
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