Why does photosynthesis require biological catalysts?

There are two primary stages to photosynthesis: the Hill's reaction, also known as the light reaction, and Blackmann's reaction, also known as the dark reaction.

The different stages of the dark reaction take place whether or not light is present. Light reaction happens when light is present. Dark reaction does not require light.

Enzymes, or biological catalysts, regulate the different steps of a dark reaction. Unlike other catalysts, the activity of enzymes is influenced by a variety of factors, such as temperature, medium pH, substrate or end product concentration, and most of the reactions that enzymes control are reversible.

The rate of photosynthesis would be too slow to support life processes without biological catalysts, which accelerate the rate of the chemical reactions involved in the process. Examples of these catalysts are enzymes, which lower the activation energy required for the reactions to occur, making photosynthesis more efficient.