Holt Modern Biology 1st Edition by John Postlethwait ,Janet Hopson

Exercise 32

Oxygen is produced during the reactions of photosynthesis, and it is used in the reactions of cellular respiration.
Part A How does oxygen get into or out of chloroplasts and mitochondria?
Part B What are the roles of oxygen in the processes of photosynthesis and cellular respiration, and how are the roles similar?