Multiple choice The reactants in photosynthesis; sun, water, and light energy are biotic. Ture True and False False Reveal answer Fill a bubble to check yourself C Correct answer Explanation The reactants in photosynthesis are carbon dioxide (CO2), water (H2O), and light energy. Sun provides the light. All of these are abiotic (non-living) components, not biotic. Therefore, the statement that they are biotic is false.