Sources of food
The material or substance which we eat is called food. Why do we need food ? Let us compare our body to a car. What happens to a car if there is no petrol in its tank ? It stops running. Petrol is the fuel which runs the car. Similarly food is the fuel which living organisms require to keep functioning. Organisms require food for the following purposes:
- To provide energy for various activity of the body
- For growth and development of the body
- To protect the body from diseases and keep it healthy
- For reproduction of damaged body parts
Certain facts about food
- There is a lot of variety in the food we eat
- We eat different food items at diffrent times of the day. Food eaten at breakfast, lunch and dinner is diffrent.
Food ingredients
Food items which we eat may consist of a single material or many materials. For example, fruits like banana,apple or mango consist of single material.
Think of food items like rice, dal, chapati /roti,kheer and idli. These food items consist of two or more materials. Materials which are used to prepare food items are called ingredients
Food eaten by animals
All living things need food to remain alive. Do you know how how living things get food? Most plants can prepare their own food . Animals including human beings, on other hand, cannot. They either eat plants or other animals
Have you seen animals like a crow (or buffalo), cat, dog, cow, squirrel, goat, lizard and lion eating food? They all eat diffrent kinds of food.
Based on the food eaten by animals can be classified into three groups or categories: herbivores, carnivores and omnivores
- Herbivores or herbivorous animals ( Herbi = plant, vore = eater ) eat only plant or plant products. Cow, buffalo, horse, deer,goats and elephants are herbivores.
- Carnivores or carnivorous animals ( Carni = meat, vore = eater )eat other animals. Lion, tiger, wolf and jackal.
- Omnivores or omnivorous animals ( Omni = all, vore = eater )eat both plants and animals. Human being, crow, cockroach are omnivores.
Sources of food
Food is obtained by living things from both plants and animals.
Plants as sources of food
You know that green plants can pre pare their own food. They prepare more food then they eat . This extra food is stored in diffrent parts of the plant body.
Diffrent plant parts from which food is obtained are the roots, stems, leaves, flowers, seeds and fruit.
Do you know which part of the plant are you eating when you eat potato, cabbage, onion, radish, carrot or mango?
The plant parts which are edible are called edible parts. For example, the edible part in mango is the fruit,in onion and potato, it is stem while in radish and carrot, it is the root, and leaf is the edible part in cabbage
Sprouts
Have you ever seen your mother buying sprouted seeds from the market or preparing them at home? How does she prepare at home?
Know the Scientist
M.S Swaminathan is known as the 'father of green revolution' in o
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