DENDROLOGY

Detailed explanation-1: -This step makes a six-carbon compound that splits into two molecules of a three-carbon compound, 3-phosphoglyceric acid (3-PGA). This reaction is catalyzed by the enzyme RuBP carboxylase/oxygenase, or rubisco.

Detailed explanation-2: -RuBisCO exists in four different forms, with form I being the most common. That form is found in the chloroplasts of plants, where it facilitates the first step of the Calvin cycle. In that stage, called the Calvin cycle, carbon dioxide combines with the carbon-based molecule ribulose bisphosphate (RuBP).