Question

Which of the following combination of physiological processes occur during photosynthesis?

• A. Water is reduced and ${CO}_2$ is oxidized
• B. Both ${CO}_2$ and water get oxidized
• C. ${CO}_2$ is reduced and water is oxidized
• D. Both ${CO}_2$ and water get reduced

Answer 1

Answer: (C)

${CO}_2$ is reduced and water is oxidized

Photosynthesis is a process of synthesizing food from sunlight and using carbon-dioxide and water as the reactants. It involves a series of electron transport reactions. In this electrons are transferred from the water to the carbon-dioxide to form glucose ($C_6{H}_{12}{O}_6$).

So, water is oxidized by loosing electrons and carbon-dioxide is reduced by gaining electrons.