Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?
A) In photosynthesis, carbon dioxide is reduced to form sugar, while in respiration, sugar is oxidized to form carbon dioxide.
B) Photosynthesis involves only oxidations, while respiration involves only reductions.
C) Photosynthesis involves only reductions, while respiration involves only oxidations.
D) In photosynthesis, carbon dioxide is oxidized to form sugar, while in respiration, sugar is reduced to form carbon dioxide.
Answer: A