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 the photosynthesis.

Photosynthesis and cellular respiration are in many respects the reverse of one another. Photosynthesis is an anabolic process, whereas cell respiration is a catabolic process. Let us know about more differences.

Here are some interesting differences between cellular respiration and photosynthesis