The deficiency of which vitamin causes night-blindness.

Vitamins are organic compounds required in the diet in small amounts to perform specific biological functions. The deficiency of which vitamins increases the time for blood clotting ?

a) Name the following: 1) A water soluble vitamin 2) An oil soluble vitamin 3) A vitamin which is neither soluble in water nor is fat 4) The disease caused. by deficiency of vitamin 'B1' 5) The diseases caused by deficiency of vitamin C' b) What do you understand by avitaminosis?