Both involve the production of chemical energy

Photosynthesis is an anabolic process

Both involve the production of an electron transport chain and chemiosmosis

In photosynthesis water is broken down to oxygen to release electrons for an electron transport chain

In photosynthesis, electrons from the transport chain are taken up by hydrogen carriers

In photosynthesis, it uses the CC to synthesise glucose

Respiration is a catabolic process

Respiration uses the Krebs Cycle to break down glucose

In respiration, the hydrogen carriers release electrons for an electron transport chain

In respiration, the electrons from the transport chain are then taken up by oxygen