Title: Effect of Light intensity on the rate of Photosynthesis - Biology Notes for IGCSE 2014
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#41 Effect of Light intensity on the rate of Photosynthesis
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Content: The gas should be checked to prove that it is indeed oxygen - relights a glowing splint. Repeat at different light intensities by moving the lamp to different distances. Photo from passmyexams.co.uk
Graph the results placing light intensity on the x-axis. Explanation
Light energy absorbed by chlorophyll is converted to ATP and H+
At very low light levels the plant will be respiring only not photosynthesising. As the light intensity increases, the rate of photosynthesis increases. However, the rate will not increase beyond a certain level of light intensity. At high light intensities the rate becomes constant, even with further increases in light intensity, there are no increases in the rate. The plant is unable to harvest the light at these high intensities and the chlorophyll system can be damaged by very intense light levels. References: skoool.ie
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