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The effect of light intensity on the rate of photosynthesis in pondweed.
PLAN
The aim is to investigate a factor that affects the rate of photosynthesis (in this case, light intensity).
A piece of pondweed will be cut at the stem (so that it is 2-3 inches in length) and placed into a beaker containing water and sodium hydrogen carbonate. A lamp will be shined on to the pondweed and the amount of bubbles released from the plant will be counted – the more bubbles, the faster the photosynthesis. The lamp will be adjusted to different distances from the plant to test the effect of light intensity on the plant when it is photosynthesising.
Photosynthesis Equation:
6CO2 + 6H2O C6H1206 + 6O2
Light intensity is to be the ONLY variable being explored in this investigation. Increasing or decreasing the distance from the light source to the plant should vary the light intensity.
Constants that are variable in normal circumstances:
Carbon Dioxide- CO2 concentration can affect the rate of photosynthesis since the more CO2 in the air, the more CO2 that can diffuse into the leaf.
Approximate Word count = 879
Approximate Pages = 3.5
(250 words per page double spaced)
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