How are photosynthesis and cellular respiration similar?
They are actually the complete opposite!
Photosynthesis is when energy, carbon dioxide and water react to produce glucose and oxygen. It is an endothermic reaction (takes in more energy than it gives off).
Respiration is the process of producing energy from glucose. It uses glucose and oxygen to give water, carbon dioxide and energy (this making it exothermic).
In plants, they make their own glucose using the suns energy, then respire to allow them to use the glucose for energy they can use. The glucose can also be stored and used in many other ways other than in respiration.
Hope this helps:)