The Environment and Photosynthesis The Environment and Photosynthesis Light. Note that only the wavelength of light that are absorbed by photosynthetic pigments can be used for photosynthesis.
Water is a reactant in photosynthesis and it is important for many other reactions.
At low humidity, stomates close and decrease both the loss of water from the plants as well as entry of CO 2 into the plant. Photosynthesis occurs within a range of temperatures and decreases both at very low and very high temperatures. Remember that the reactions of photosynthesis are facilitated by enzymes and the rates of enzymatic reactions are affected by temperature. A living organism is like a running clock. If it is not wound up it will sooner or later run out of free energy and stop.