Question

which substances are the reactants in photosynthesis? water and carbon dioxide; water and sugar; carbon dioxide and oxygen; sugar and oxygen

Explanation:

The process of photosynthesis in plants uses light energy to convert reactants into products. The chemical equation for photosynthesis is \(6CO_2 + 6H_2O \xrightarrow[\text{Chlorophyll}]{\text{Light Energy}} C_6H_{12}O_6 + 6O_2\). From this equation, the reactants (substances used) are water (\(H_2O\)) and carbon dioxide (\(CO_2\)). Sugar (glucose, \(C_6H_{12}O_6\)) and oxygen (\(O_2\)) are products, so options with sugar or oxygen as reactants are incorrect.

Answer:

A. Water and carbon dioxide