Green plants make their own food. To make food, they need water, carbon dioxide and light energy. The food is usually made in the leaf cells. Photosynthesis is the process by which food is made in the plant. Plants use this food to carry out respiration.
Respiration is the process by which living things use oxygen to release energy.
Some of this energy released is used for reproduction. Reproduction is the process by which living things produce new living things of their own kind. To show how green plants need sunlight, we will cover a few leaves on a green plant. We will leave these for about one week. We will observe the color and condition of the covered leaves.