Investigation of what affects the production of starch in plants

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Stuart Shepherd


Ms O’Reilly

Investigation of what affects the production of starch in plants


To discover whether light affects the production of starch in a plant.


Green plants use energy from light to make carbon dioxide and water into food. This process is called photosynthesis. Green plants also produce oxygen during photosynthesis.

Carbon dioxide (CO2) is a gas found in the air. During photosynthesis, CO2 is combined with water (H2O) to make glucose and oxygen. Glucose is the sugar that plants use for food.

Plants store glucose by converting it into starch. Glucose is soluble and in a high concentration could damage could damage the plant, so the plant converts unused glucose into starch, which is stored in the cytoplasm of the plant. Starch molecules are long strings of glucose.

The Photosynthesis word and chemical equations are as follows:

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Carbon Dioxide + water + light energy  glucose + oxygen

                6CO2 + 6H2O (+ light energy) C6H12O6 + 6O2


Plant, -- Soil --Tin Foil

Water -- Light -- Iodine

Bunsen Burner -- Gauze --Tripod

Boiling Tube -- Ethanol -- Plant Pot

Tweezers -- Beaker -- Kettle

Pipette --Tile -- Blue Tac


Take a leaf from the plant(do not remove it from the plant). Cover a small area of the leaf with tin foil. Using blue tac to stick the ...

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