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Photosynthesis

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

What is Photosynthesis?
Green plants make their own food in a process called photosynthesis. Almost all life on Earth depends upon this process. Photosynthesis is also important in maintaining the levels of oxygen and carbon dioxide in the atmosphere.

Plants need the following for photosynthesis: carbon dioxide, water, light (a source of energy), chlorophyll (in the plant cell).
These are the things that plants make by photosynthesis: glucose, oxygen.

Here is the word equation for photosynthesis:
carbon dioxide + water → glucose + oxygen

Plants get carbon dioxide from the air through their leaves, and water from the ground through their roots. Light energy comes from the Sun. The oxygen produced is released into the air from the leaves. The glucose produced can be turned into other substances, such as starch and plant oils, which are stored in the leaves and other parts of the plant. This then provides food for other animals.

The following video explains photosynthesis. It also shows that light is needed and oxygen is produced during photosynthesis.



To Show That Starch Is Made During Photosynthesis To Show That Carbon Dioxide Is Necessary for Photosynthesis To Show That Chlorophyll is necessary for Photosynthesis
Use a variegated leaf.

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