Science Class 3 Chapter 4 Full Details

Science Class 3 Chapter 4 Full Details

Science Olympiad in grades 1-12, like a basketball or hockey team, involves year-round training, dedication, guidance, and practice. The National Science Olympiad (NSO) test is a global Olympiad competition in which students from all over the globe participate. It gives a platform for emerging talent to showcase their skills. Learners require these tests to prepare both for national and international competitions. This page is about Science Class 3 Chapter 4: Food.

Science Olympiad Class 3

Science Class 3 Chapter 4: Food

Food is required by all living things. People who are vegetarians do not consume meat or fish. Non-vegetarians are those who eat meat, fish, or both. Plants and animals both provide food.

We can’t live without food since it gives our bodies the energy they need to function correctly. Our bodies require energy even when we are sleeping. Whether we are working or relaxing, several organs are continually at work. Food contributes to illness prevention and treatment.

Our bodies receive nutrients from food. Different foods contain differing levels of certain nutrients. Nutrients include carbohydrates, proteins, vitamins, lipids, and minerals. We must eat a balanced diet to support good body functioning since no one item offers all of the nutrients in the correct proportions.



Carbohydrates are an important nutritional type. It gives the body energy, particularly to the brain and nerve system. Walking, dancing, writing, jumping, walking, and other tasks all demand energy. Sugars may be found in a variety of foods, including fruit (apples, grapes), veggies (potatoes and pumpkin), milk, dairy products, whole-grain pieces of bread,  cereal (wheat, maize, and rice), vegetables, lentils, and processed sugar.


Fats, like carbs, provide the body with the energy. Whenever carbohydrates are in short supply, they act as an energy store. It helps the body absorb fat-soluble nutrients. It helps to keep the body warm by preserving the core temperature stable. Oil, butter, almonds, coconut, ghee, and cream are all high in fat.


It’s required for bodily upkeep and repair. Growing children require more protein. Protein is essential for the proper functioning of the hair, skin, eyes, muscles, and other organs. It is a protein that is a key component of blood and assists in the transfer of oxygen throughout the body. Protein-rich foods include meat, fish, cheese, beans, lentils, yogurt, almonds, and seeds.

Vitamins and Minerals

Vitamin A helps to create and maintain healthy teeth, bones, and skin. It also helps with red blood cell production and nervous system upkeep.
Calcium, iron, salt, potassium, and other minerals are all required by the body. We need all minerals in the proper proportions to remain healthy.

Our bodies require calcium to maintain strong bones and teeth. Calcium is acquired via milk and milk derivatives, among other sources. Another mineral that contributes in the production of blood is iron. Iron is abundant in red meats, dried fruits, and green leafy vegetables.

Fiber and Water

Dietary fiber, often known as roughage, is the part of plant-based diet that is indigestible. Fiber is found in fruits and vegetables, as well as grains and pulses’ outer coverings. Water and fiber assist in digestive system cleaning by eliminating waste from the body. Water contributes in body temperature control.

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