Both cellular respiration and photosynthesis are parts of a mutually beneficial relationship.  Photosynthesis cannot occur without cellular respiration and cellular respiration certainly cannot occur without photosynthesis.

Photosynthesis and cellular respiration are in many respects the “reverse” of one another. Photosynthesis is an anabolic process, whereas cellular respiration is a catabolic process. Let us explore more differences between cellular respiration and photosynthesis