External Factors Affecting Photosynthesis - QS Study
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Factors involved in photosynthesis are of two types – External and Internal factors.

Sunlight: Sunlight is essential for photosynthesis. The high-energy compound – ATP and NADPH2 are formed utilising the Sunlight which help carbon reduction in dark phage. High intensity of light reduces the rate of Photosynthesis.

Carbon dioxide: Manufacture of carbohydrate is not possible without carbon dioxide. Thus if the amount of CO2 reduces in air (in air there is 0.03% of CO) the rate of photosynthesis reduces.

Water: Water makes the guard cells turgid and the stomata opens on the other hand water is utilised as a raw material in dark phase of the process.

Temperature: Photosynthesis seized near 0;C and above 45; of temperature. Optimum temperature for photosynthesis is 22C- 35C. Below 22C and above 35C rate of photosynthesis decreases.

Oxygen: If density of oxygen increases in atmosphere the rat of photosynthesis will decrease.