1. Photosynthesis Equation
D. Crowley, 2008

2. Photosynthesis Equation
Sunday, February 17, 2019Sunday, February 17, 2019
To know the equation for photosynthesis

3. Weight Gain light energy carbon dioxide glucose (from the air) oxygen
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
chlorophyll
carbon dioxide
(from the air)
glucose
oxygen
water
(from the soil)

4. carbon dioxide + water  glucose + oxygen
Photosynthesis
chlorophyll light energy
carbon dioxide + water  glucose + oxygen
6CO2 + 6H2O  C6H12O6 + 6O2

5. Photosynthesis

6. 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

7. 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

8. 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 cling-film should have sufficient light to grow normally

9. Word Equation