The rate of photosynthesis is influenced by a number of factors.
Internal and external variables are included in this list.
Internal factors that influence photosynthetic rate: anatomy of the leaf, hormones produced by plants, the amount of chlorophyll in the body, the Calvin Cycle's enzyme activity, and the ability of metabolite transport mechanisms to carry out their functions.
External factors that influence photosynthetic rate: temperature, pH levels in the soil, the intensity of the light, weather conditions, and concentration of carbon dioxide.