Question

During photosynthesis, the following reaction takes place:

carbon dioxide + water + light energy → sugar + oxygen


During cellular respiration, the following reaction takes place:

sugar + oxygen → carbon dioxide + water + chemical energy


Given this information, how are photosynthesis and cellular respiration related?
A.
The same type of energy is found in both photosynthesis and cellular respiration.
B.
Photosynthesis and cellular respiration both start with the same materials.
C.
Photosynthesis and cellular respiration both produce the same materials.
D.
The products of photosynthesis are the reactants of cellular respiration.

Answer 1

D. The products of photosynthesis (sugar and oxygen) are the reactants of cellular respiration, so the two processes are essentially reverse reactions that cycle energy and matter.