Some science for the gardener

This is Section 3 of the Gardening Seminar:Start your own garden. Comments or questions are appreciated. You can also write to John Eagles.

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Photosynthesis

Diagram of the process of photosynthesis

Main article: Photosynthesis

All green plants can be seen as little factories that produce energy and food for all other living beings. The basic elements they need for this are water, air and sunlight. The process that runs in these countless factories is called 'photosynthesis.'

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. It is the magical process that makes all our gardening and farming worthwhile. Air (carbondioxide) and water and sunlight are transformed into energy (sugar) and the structural element (carbon) for cells and oxygen to breathe.

Photosynthesis is vital for all life on Earth that needs oxygen.

1. Photosynthesis maintains normal levels of oxygen in the atmosphere
2. It is the source of energy for building up the cells of an organism in which photosynthesis occurs, or as a source of food, it gives this energy to other organisms. For example, humans and animals eat plants.
   

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