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CBP PP1 Photosynth

CBP PP1 Photosynth - CBP PP1 Photosynth

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LR/CC/CBP Soil or Water? Van Helmonts experiment c. 1600 Plant in a pot Grow for 5 years, water Weigh plant, = ? Weigh soil = ? Conclusion ?
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LR/CC/CBP The Air Problem Air known to be essential to life L Combustion or respiration known to exhaust air L Air once used could no longer support life or fire How did the atmosphere stay pure through countless generations?
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LR/CC/CBP Used Air? Joseph Priestley 1780 Royal Medal L 17 th August 1771 L 27 th August 1771 Rejuvenation of used air L Medal citation “ for these discoveries we are assured that no vegetable grows in vain but cleanses and purifies our atmosphere
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LR/CC/CBP Green Parts Ingenhousz L Repeated Priestley’s experiments L Established 2 key points Purification of air only worked in sunlight Only worked with the green parts of plants
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LR/CC/CBP Evolution of gas Light dependent evolution of bubbles L Collected bubbles shown to be oxygen L Air rejuvenated by adding oxygen
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