Revise: PhotosynthesisUses of the sugar produced by photosynthesis

Photosynthesis is the process by which green plants use sunlight energy to make their own food. It takes place inside the chloroplasts of plant cells.

Part ofBiologyRevision guides: Life on Earth

Uses of the sugar produced by photosynthesis

Energy source

The sugar can be broken down in plant cells by the process of respiration to generate ATP. The chemical energy released by respiration can be used by the plant for cellular activities such as protein synthesis or cell division.

Plant energy storage

The sugar produced by photosynthesis can be converted into the sugar glucose. Thousands of glucose molecules can be linked together to form the complex carbohydrate starch. is stored inside plant cells as grains.

Plant building material

The sugar produced by photosynthesis can be converted into the sugar glucose. Thousands of glucose molecules can be linked together to form the complex carbohydrate cellulose. Cellulose is a very tough molecule that is used to build the cell wall of plant cells.

A leaf magnified to show a plant cell. The plant cell is magnified showing the microfibril structure. This too is magnified to show the cellulose molecule.
Figure caption,
A leaf magnified to show a plant cell, microfibril and cellulose molecule

Production of other types of food

Sugar is an example of a : it contains the chemical elements carbon, hydrogen and oxygen. Plant cells can convert the sugar into another type of energy storage molecule - fat.

Plant cells can also combine sugars with nitrates to make amino acids and use these to produce proteins.