you can never really have too much carbon dioxide ln the atmosphere. but the light level needs to match the level of carbon dioxide in the atmosphere in order for photosynthesis to take place effectively.
It depends on the conditions - If the factors causing photosynthesis (temperature, amount of CO2, etc) increase, then so will the rate of photosynthesis (to an extent).
By increasing the thickness of a leaf the process of photosynthesis will become longer. This is because the sun has to penetrate through the leaf to the chloroplasts so that the chloroplasts can...
Photosynthesis uses carbon dioxide, water, and light to give plants food and oxygen. The plants then give off oxygen for our use, since humans need oxygen to survive.