Question

(a) Define nutrition. Why is nutrition necessary for an organism?

Answer 1

The process of intake and utilisation of nutrients (like carbohydrates, fats, proteins, minerals, vitamins and water) by an organism is called nutrition. In simpler words, the process of taking in food (consuming food) and utilising it is called nutrition.
Nutrition is necessary for an organism because

1. It provides the energy required to carry out all the various metabolic life processes like breathing, digestion, excretion, etc. Carbohydrates and fats are the major energy-giving nutrients.
2. It is required for the growth and development of the body cells. Proteins and minerals are used in the biosynthesis of body constituents like skin, blood, etc.