If solution-filled syringes with certain amounts of CO2 are tested to see how the increase of CO2 will affect the photosynthetic rate of spinach disks, then the more CO2, the faster the rate.
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Due to time constraints and material constraints, the student could not properly test how the "increase" of CO2 would affect photosynthesis, but theoretically the increase would increase the rate was well.
The Effect of Light on Photosynthesis :: Papers - 123HelpMe
Green or yellow light will have the slowest rates of photosynthesis because they are reflected by the pigments in the plant.
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In this lab experiment, the team examines how the rate of photosynthesis is affected by different light colors in the leafs.
Effect of Light on Photosynthesis ..
An additional trial that included "sunlight" would have been preferred, but with the time and materials available, it was difficult to achieve such results.
Research can show that the more CO2 there is, the faster the rate of photosynthesis, until it plateaus, anyway.