BECE Science 2014 Paper

Concept:In aerobic respiration, glucose is broken down to release energy, producing waste substances.Explanation:The equation for aerobic respiration is:$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + \text{energy}$The useful product is energy, while carbon dioxide and water are produced as by-products.Heat may be released as part of energy, but the main chemical by-products are carbon dioxide and water.Answer:B. carbon dioxide and water