9 Where does light reaction take place. 5 What is photosynthesis and where does it occur. The Structure Of The Chloroplast Principles Of Biology Most important enzyme in photosynthesis Most abundant enzyme on earth Carboxylation- rubisco catalyzes the addition of CO2 onto a five-carbon sugar adding carbons high co2 concentration Or Oxygenation - catalyze combination of RuBP and oxygen to release CO2 producing oxygens low co2 concentration. . 12 Where does Calvin cycle occur in a chloroplast give a schematic representation of the cycle. Herbivores then obtain this energy by eating plants and carnivores obtain it by eating herbivores. 13 What part does chlorophyll play in photosynthesis. 8 Does photosynthesis release energy. Where does photosynthesis usually occur. 10 In which plant. Photosynthesis takes place inside the chloroplasts that sit in the mesophyll of the leaves. 10 How does the process of photosy