How does light intensity effect CO2?

Question

For example, what if an aquatic plant kept in the dark had a highter level of Co2 then an aquatic plant kept in the light?

Answer 1

Light intensity effects the rate of photosynthesis. So the higher the light the more CO2 is converted to O2. In the presence of plants the higher the light intensity the lower the level of CO2 and th lower the light the higher the level of CO2.

Nut Gobbler, I was trying to keep my answer as simple and non technical as possible but since Mr. Hayden160 has called my answer dumb ("like what was said by the one before me") I will have to clear my answer up a little.
In photosynthesis 6H2O + 6CO2---------C6H12O6 + 6O2
Since most of us don't speak chemicalese that translates as
six molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen.
So in photosynthesis the plant takes in carbon dioxide and releases oxygen and the higher the light intensity the more photosynthesis thus the higher the consternation of O2 and lower consternation of C02. I hope that helps a little. You asked a good question and it deserves a honest answer.

Answer 2

the amount of carbon (in the form of co2) that can be fixed to produce carbohydrate is solely dependant on the products from the light reactions (ATP and NADPH)..those are the limiting factors, not anything else
so with high light intensities the plant will make more ATP and NADPH so those will go in the calvin cycle and therefore there is more substrate able fix more CO2..thats why at night there is no carbon fixation because there is no energy to do it

ps CO2 doesnt produce the O2 that is released like what was said in the answer before me, thats just dumb