What factors affect the process of photosynthesis and cellular respiration?

first, Cellular Respiration second.

Photosynthesis:

• the intensity of the light being absorbed by the chloroplasts
• the concentration and availability of CO2 (Carbon Dioxide)
• the temperature

Cellular Respiration

• the availability of oxygen (determines whether or not fermentation will be used)
• the availability and amount of glucose (the food being broken down)
• affected by the temperature of the cell enviornment