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A vitamin is a vital substance needed in small quantities for growth and good health.

A vitamin is a vital substance needed in small quantities for growth and good health. Vitamins are vital body regulators. They may be defined as a group of potent organic compounds that are present in food and are essential in minute quantities for specific functions of growth, maintenance, and reproduction. Most of them are not synthesized by the body and must be supplied through diet. The word vitamin was coined by Casimir Funk who discovered a water-soluble substance in rice polishing which prevents beriberi. He described this compound as vital amine, hence he named the substance vitamins. [Image will be uploaded soon] Vitamins

Ans. In eyes, Vitamin A deficiency can be seen commonly as-

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