Concise Selina Solutions for Class 9 Biology Chapter 10 Nutrition


“Nutrition is the process of taking in food and converting it into energy and other vital nutrients required for life.” We are indulged in a lot of daily activities. We need to carry out these activities a large amount of energy. This energy comes from the food we consume. Food is vital as it provides the energy required for growth, repair, and other life processes. All these come under the life process called nutrition. Nutrition is the science that interprets the nutrients and other substances in food to maintenance, growth, reproduction, health and disease of an organism. It includes ingestion, absorption, assimilation, biosynthesis, catabolism and excretion. There are two types of nutrients which we need for our survival, micronutrients, and macronutrients. This division is based on the quantity of a nutrient the body needs. We need micronutrients (vitamins and minerals) in small amounts and macronutrients (carbohydrates, proteins, and fats) in the large amount.