How does carbon dioxide concentration affect photosynthesis rate?

An increase in the carbon dioxide concentration increases the rate at which carbon is incorporated into carbohydrate in the light-independent reaction - and so the rate of photosynthesis generally increases until limited by another factor.

Explanation:

CO2 concentration is directly proportional to rate of photosynthesis.

CO2 is raw material for process of photosynthesis.

CO2 + H2O → C6H12O6 + O2

Increase in CO2 concentration increases rate of photosynthesis.

Decrease in CO2 concentration decreases rate of photosynthesis.

Therefore, CO2 concentration is limiting factor for rate of photosynthesis.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

the areas around the equator