Title: What is Photosynthesis? How It Occurs? - SCIENCE & BIOLOGY
Headings: 

Content: Light intensity
As light intensity increases, so does the rate of photosynthesis. This occurs until it reaches a point where, no matter how much light is available, the rate of photosynthesis will increase no more. There could be the light of a million suns shining on that plant but photosynthesis cannot go faster once this point is reached. This is because something else, such as CO2 concentration, water availability or temperature could be limiting the rate. ​Often with high light intensity (strong light) comes higher temperatures. CO2 Concentration
As the concentration of carbon dioxide increases, so does the rate of photosynthesis. This occurs until it reaches a point where, no matter how much carbon dioxide is available, the rate will increase no more. There could be all the carbon dioxide in the world available to the plant but photosynthesis cannot go faster. This is because something else, such as light intensity, temperature or water availability, could be limiting the rate. Or it could be that all the enzymes are working at maximum speed and can't work any faster!