Photosynthesis

A Summary Of Photosynthesis

 

Plants make their own food in their leaves. They do not get food from the soil or from water. The leaves can make food for the plant because they are green.

 

The green chemical in a leaf is called CHLOROPHYLL.

Plants make food in a process called PHOTOSYNTHESIS.

Photosynthesis can take place slowly or quickly. It depends on the temperature, access to water, light and carbon dioxide. Photosynthesis takes place more quickly when it is warm. Plants also grow faster when more carbon dioxide is available.

Photosynthesis is the chemical change which happens in the leaves of green plants. It is the first step towards making food - not just for plants but for every animal on the planet.  Plant cells contain chloroplasts.  Chloroplasts contain a chemical called chlorophyll which enables the plant to absorb light energy from the sun.   

  • Glucose is produced during photosynthesis.

  • Plants make glucose because it is water soluble so it can be transported around the plant.

  • Glucose can also be converted into cellulose which is used in cell walls and fats and proteins which the plant needs.

  • Glucose is soluble in water so it is stored as starch which is insoluble.

  • Plants convert starch back into glucose when it is needed for respiration.

Photosynthesis
Autumn Leaves Loopy Science

You may have noticed that leaves change colour and fall off the tree in autumn.  Why?

Click on the picture above and watch the video.

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