Why are vitamin A and vitamin C essential to us? Give their important sources.

The deficiency of Vitamin A leads to Xerophthalmia which is hardening of the cornea of the eye and night blindness as well. Vitamin-C is essential to us because its deficiency causes scurvy which is a phenomenon of bleeding gums; and pyorrhoea which is phenomenon of loosening-bleeding of teeth.

The sources of vitamin A are fish, cod liver oil, carrots, butter and milk. 

The sources of vitamin C are citrus fruits, lemon, amla and green leafy vegetables.