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Standard IX
Biology
Vitamin Deficiency
Question

Vitamin-D is synthesized in skin by the action of sunlight on?
  1. Cephalin cholesterol
  2. All of the above
  3. 7-Hydroxycholesterol
  4. Cholesterol

A
7-Hydroxycholesterol
B
All of the above
C
Cholesterol
D
Cephalin cholesterol
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Solution
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Vitamin D3 is synthesized in the skin by the reaction of 7-dehydrocholesterol with UVB radiation, present in sunlight with an UV index of three or more.
So, option A is the correct option.

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