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Unit C: Biology (Cycling of Matter in Living Systems) – Assignment Answer Key C3.2 Check and Reflect #1 – 3, 5, 7a, 8 1. Photosynthesis is the process in which the chloroplasts in plant cells convert light energy into potential chemical energy for later use. It requires chemical reactants water and carbon dioxide, and creates chemical products glucose and oxygen. word equation: water + carbon dioxide chlorophyll + light glucose + oxygen chemical equation: 6H2O(l) + 6CO2(g) → C6H12O6(aq) + 6O2(g) 2. The role of chlorophyll in photosynthesis is to absorb light energy and convert it into potential chemical energy. 3. In sunlight, plants can carry out both photosynthesis and cellular respiration. In the dark, plants can only carry out cellular respiration as light energy is a requirement for photosynthesis to occur. 5. Agree. Chloroplasts are the sites of photosynthesis and produce glucose and oxygen from carbon dioxide and water, while mitochondria are the sites of cellular respiration and produce carbon dioxide and water by breaking down glucose with oxygen. 7. a) If more carbon dioxide was available, photosynthesis should be able to occur at a faster rate as long as there was also enough water and sunlight available. 8. Answers may vary. One possible answer: The warmer temperature within the greenhouse will cause more water to evaporate through the leaves, which will keep water and nutrients flowing up through the plant at a faster rate.