(a) What is a balanced diet? (b) Name the classes of food stating the importance of any two to the human diet. (c) In a tabular form, state the source, substrate and end products of the following enzymes: (i) ptyalin: (ii) pepsin; (iii) lipase.
Explanation
(a) Balanced Diet; is a diet containing all the six food classes/types of food in the right proportion to meet the body's requirement for growth, repair and maintenance. (b) Classes of food: -Protein -Carbohydrate -Vitamins -Water -Mineral salts/nutrients -Fats and Oils/Lipids. Importance of food classes
Food substances
Importance
Carbohydrate
Energy giving
protein
Growth/replacement/repair of worn out cells/repair of tissues
Fats and oil
Energy source/formation of adipose tissue for insulation
Vitamins
for proper functioning/maintenance of the body
Mineral salts/nutrients
play specific roles in metabolic processes/maintenance of the body
water
Medium for various metabolic processes/named processes
(c) The source, substrate and end products of ptyalin, pepsin and lipase are tabulated below:
