Limiting Factors in Photosynthesis — NEET Biology

The external factors would include the availability of sunlight, temperature, CO₂ concentration and water. As a plant photosynthesises, all these factors will simultaneously affect its rate. Hence, though several factors interact and simultaneously affect photosynthesis or CO₂ fixation, usually one factor is the major cause or is the one that limits the rate. Hence, at any point the rate will be determined by the factor available at sub-optimal levels.