This quiz is a quick quiz designed to evaluate student understanding of the conservation of matter (via balanced chemical equations), and the conservation of energy through photosynthesis and cellular respiration. The quiz requires students to recall the chemical equations for both photosynthesis and cellular respiration, and to be able to apply their knowledge to answer questions about conditions in plants that will lead to an increase or a decrease in mass. The last 2 questions have some science humor . . . just to add a little fun to taking a quiz.