Calorific value of 1 g of carbohydrates is
4 cal
9 cal
6 cal
2 cal
Calorific values of respiratory substrates:
1g of Carbohydrates = 4 cal.
1g of proteins = 4 cal.
1g of fats = 9 cal.
Vitamins and minerals = no calories
Hence, the correct option is a.