Which of the following statements is true about photosynthesis and cellular respiration?

a. both processes use oxygen as a reactant.

b. Plants perform photosynthesis

c. Plants perform cellular respiration

d. Plants perform both of photosynthesis and cellular respiration

The answer is D.

Photosynthesis is the process through which plants utilize water and carbon dioxide to form glucose and oxygen. This process enables plants to "make their own food"; however, they still have to "eat their food". The reaction involved in "eating" is respiration. During respiration, energy from glucose is released by reacting it with oxygen to form carbon dioxide and water.