Food–Where does it come from Notes

INTRODUCTION

What is food?

•    Food is any substance consumed to provide nutritional support for the body.

•    It contains all the essential nutrients.

•    All living things, including human beings, need food in order to stay alive.

•    The food that we eat helps us in many ways.

Importance of Food:

FOOD FROM PLANTS

•    Green plants prepare their own food.

•    For this reason, they are known as 'producers'.

•    They use sunlight, air (carbon dioxide), water, and chlorophyll (in their leaves) to make their own food by the process of photosynthesis.

Sunlight + Carbon dioxide + Water + Chlorophyll

Sugar (organic food)

Process of photosynthesis in green plants

•    Different plant parts serve as sources of food for us.

ROOT

 •    The root is the part of a plant that lies below the surface of the soil.

•    Roots of  some plants are consumed as food like:

Examples:

Carrot:

1. It is a root vegetable.

2. It is usually orange in colour.

3. Carrot juice is considered as a healthy drink.