What are vitamins? Give examples for the vitamin deficiency diseases.

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Vitamins are organic substances. They are micronutrients required in small quantities. Vitamins are not synthesised in the body and therefore they are essential nutrients. some examples of vitamin deficiency disease are-

S. No. vitamin deficiency Deficiency diseases

1. Thiamine (B₁) Beri beri

2. Riboflavin (B₂) Glossitis

3. Niacin (B₃) Pellagra

4. Pyridoxine (B₆ Anaemia

5. Cyanocobalamine (B₁₂) Pernicious anaemia

6. Folic acid (B₉) Anaemia

7. Pantothenic acid(B5) Burning feet

8. Biotin(B7) Nerves disorders

9. Ascorbic acid (Vitamin C) Scurvy

10. Retinol (Vitamin A) Night blindness, Xerophthalmia, Rupture of the cornea, Scaly skin

11. Calciferol (Vitamin D) Rickets, fragile bones

12. Tocopherol (Vitamin E) Fertility disorders, Sterility in males, Abortions in females

13. Phylloquinone (Vitamin K) Blood clotting

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S. No.	vitamin deficiency	Deficiency diseases
1.	Thiamine (B₁)	Beri beri
2.	Riboflavin (B₂)	Glossitis
3.	Niacin (B₃)	Pellagra
4.	Pyridoxine (B₆	Anaemia
5.	Cyanocobalamine (B₁₂)	Pernicious anaemia
6.	Folic acid (B₉)	Anaemia
7.	Pantothenic acid(B5)	Burning feet
8.	Biotin(B7)	Nerves disorders
9.	Ascorbic acid (Vitamin C)	Scurvy
10.	Retinol (Vitamin A)	Night blindness, Xerophthalmia, Rupture of the cornea, Scaly skin
11.	Calciferol (Vitamin D)	Rickets, fragile bones
12.	Tocopherol (Vitamin E)	Fertility disorders, Sterility in males, Abortions in females
13.	Phylloquinone (Vitamin K)	Blood clotting