Multiple Choice
Which of the following statements is true about photosynthesis and cellular respiration?
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9. Photosynthesis
Introduction to Photosynthesis
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Which reactant in the photosynthesis equation is the source of hydrogen for sugar molecules?
A
Oxygen ($O_2$)
B
Water ($H_2O$)
C
Carbon dioxide ($CO_2$)
D
Glucose ($C_6H_{12}O_6$)
Verified step by step guidance1
Understand the process of photosynthesis: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose ($C_6H_{12}O_6$). The general equation for photosynthesis is: $6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6O_2$.
Identify the components of the photosynthesis equation: The reactants are carbon dioxide ($CO_2$) and water ($H_2O$), and the products are glucose ($C_6H_{12}O_6$) and oxygen ($O_2$).
Determine the source of hydrogen in glucose: Glucose ($C_6H_{12}O_6$) contains hydrogen atoms. These hydrogen atoms must come from one of the reactants in the photosynthesis equation.
Analyze the role of water ($H_2O$): Water molecules are split during the light-dependent reactions of photosynthesis in a process called photolysis. This releases hydrogen ions ($H^+$), which are used to form glucose during the Calvin cycle.
Conclude that water ($H_2O$) is the source of hydrogen: Based on the splitting of water during photolysis, the hydrogen atoms in glucose originate from water ($H_2O$).
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