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Increasing the light intensity will boost the speed of photosynthesis. Carbon dioxide concentration. Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
Carbon dioxide is an essential reactant for photosynthesis to occur. If there is a higher concentration of carbon dioxide, then the rate of photosynthesis will increase, and v â¦ ise versa. If the concentration of carbon dioxide decreases, then the rate at which a plant photosynthesizes will be slower.Resources: I'm an advanced bio student, and we conducted an experiment to test this.f there is a higher concentration of carbon dioxide, then the rate of photosynthesis will increase, and v â¦ ise versa. If the concentration of carbon dioxide decreases, then the rate at which a plant photosynthesizes will be slower. Resources: I'm an advanced bio student, and we conducted an experiment to test this.