Please see the diagram. Photosynthesis produces oxygen and glucose, which can be used by cellular respiration as raw materials to make water, carbon dioxide, and ATP, all of which are used by photosynthesis to produce glucose and oxygen, driving the cycle from one pole to another. NADPH (photosynthesis) and NADH (cellular respiration) are temporary energy carriers (shown in parentheses) which are, nevertheless, crucial for the overall process.
Work Step by Step
The way to approach this question is to look for chemicals common to the two processes, as listed in the answer. Then see how those might be reactants for one process and products for the other.