# What is photosynthesis?

Plants make their own food using . The food produced is the sugar called glucose. Food produced by plants is important, not only for the plants themselves, but for other organisms that feed on the plants.

can also make their own food by the process of photosynthesis. Plant will increase as a result of photosynthesis.

During photosynthesis, plants produce and oxygen from and water, using light energy from the Sun.

The following equations summarise what happens in photosynthesis:

$\text{carbon dioxide} + \text{water} \xrightarrow[chlorophyll]{light} \text{glucose}+ \text{oxygen}$

Be careful not to confuse this photosynthesis equation with respiration which is the reverse of this.

Photosynthesis is an reaction as it requires light energy to react carbon dioxide and water to produce glucose and oxygen.

The light energy required is absorbed by a green pigment called in the leaves. Chlorophyll is located in in plant .

Plant leaves are the main for photosynthesis.

The carbon dioxide required for photosynthesis comes from the air. It enters leaves through the . Water enters the plant through the roots, and is transported to the leaves in the .

Oxygen is formed as a product. Some is used for respiration. During the day, provided the rate of photosynthesis is high enough, plant and algae give out oxygen.

Some of the glucose produced by photosynthesis is used for .

Glucose is the starting point for making the materials that plants need to live. These materials are used to make cell walls and other cell components and will enable the plant to growth and increase in biomass.

The glucose not used for respiration is used in the following ways: