Which of the following is NOT a determinant of the rate of photosynthesis?

The rate of photosynthesis is influenced by several key factors, commonly referred to as determinants. Light intensity plays a crucial role, as higher light levels generally increase the rate of photosynthesis until a certain saturation point is reached. Temperature affects enzymatic activity within the photosynthetic process, where too low or too high temperatures can inhibit this activity. The amount of carbon dioxide also directly influences the photosynthesis process, as it is one of the substrates plants use to produce glucose and oxygen.

Soil pH, while important for plant health and nutrient uptake, does not directly influence the rate of photosynthesis itself. Instead, it affects the availability of certain nutrients in the soil, which can indirectly impact plant growth and overall health. Therefore, it is not considered a direct determinant of photosynthesis compared to the other factors listed.