Final answer:
The second phase of photosynthesis is called the Calvin Cycle, in which carbon dioxide is converted into carbohydrate molecules using the energy generated by ATP and electron carriers.
Step-by-step explanation:
The ATP and electron carriers in plants supply the energy needed for the second phase of photosynthesis, a biochemical cycle called the Calvin Cycle. In this cycle, carbon dioxide is fixed from the environment and converted into carbohydrate molecules using the energy stored in ATP and NADPH.