Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?
◦ In photosynthesis, carbon dioxide is oxidized to form sugar, whereas in respiration, sugar is reduced to form carbon dioxide.
◦ Photosynthesis involves only oxidations, whereas respiration involves only reductions.
◦ Photosynthesis involves only reductions, whereas respiration involves only oxidations.
◦ In photosynthesis, carbon dioxide is reduced to form sugar, whereas in respiration, sugar is oxidized to form carbon dioxide.