DENDROLOGY

Detailed explanation-1: -As it is normally present in the atmosphere at very low concentrations (about 0.04%), increasing carbon dioxide concentration causes a rapid rise in the rate of photosynthesis, which eventually plateaus when the maximum rate of fixation is reached.

Detailed explanation-2: -Rate of photosynthesis increases with an increase in the intensity of light.

Detailed explanation-3: -Initially, increasing temperature increases the rate of photosynthesis, as more energy is provided. Above a certain temperature (about 45 degrees Celsius), the enzymes involved in the reaction begin to denature and, consequently, the rate of the reaction begins to drop sharply until it stops altogether.

Detailed explanation-4: -Carbon Dioxide Concentration As levels of carbon dioxide increase, the rates of photosynthesis also increase. This only goes up to a certain point, when the plant has reached its maximum rate of photosynthesis.