NCERT Class XII Chemistry
Chapter - Biomolecules
Questions with Solutions

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Question : 20
Total: 33
Why are vitamin A and vitamin C essential to us? Give their important sources.
Solution:  
Deficiency of vitamin A causes Xerophthalmia (hardening of cornea of the eye) and night blindness. So its use is essential to us. It is available in fish liver oil, carrots, butter and milk. It promotes growth and increases resistance to diseases. Vitamin C is very essential to us because its deficiency causes Scurvy (bleeding of gums) and pyorrhea (loosening and bleeding of teeth). Vitamin C increases resistance of the body towards diseases. Maintains healthy skin and helps cuts and abrasions to heat properly. It is soluble in water. It is present in citrus fruits, e.g.,oranges, lemons, amla, tomatoes, green vegetables (Cabbage) chillies, sprouted pulses and germinated grains.
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