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Photosynthesis Equation D. Crowley, 2008 Photosynthesis Equation To know the equation for photosynthesis Weight Gain • How can a plant put on weight?! • Plants make their own food via photosynthesis (chlorophyll in the leaves) with the energy coming from the Sun light energy carbon dioxide (from the air) water (from the soil) chlorophyll glucose oxygen Photosynthesis chlorophyll light energy carbon dioxide + water glucose + oxygen 6CO2 + 6H2O C6H12O6 + 6O2 Photosynthesis Experiment • How could you design an experiment proving that sunlight is needed for photosynthesis? • Set up an experiment using 3 Petri dishes containing some damp cotton wall with cress seeds in – Black one out completely (with dark paper) – Have one slightly covered (with tracing paper) – Have one clear (covered with cling film) Dark paper Tracing paper Cling film Prediction • Once you have set up your experiment, predict what you will find and why • Photosynthesis requires carbon dioxide, water, and light to occur • In this experiment we have kept the carbon dioxide and water the same - only the light levels have changed Prediction • We should find that when there is insufficient light photosynthesis will not take place, and the cress seeds will not grow (when placed in the dark Petri dish) • The cress should get some light with the tracing paper, so should grow a little • The cress with the clingfilm should have sufficient light to grow normally Word Equation