Multiple Choice
What is the primary role of sunlight in the light reactions of photosynthesis?
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9. Photosynthesis
Light Reactions of Photosynthesis
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Which of the following is an input required for the light-dependent reactions of photosynthesis?
A
Glucose ($C_6H_{12}O_6$)
B
Water ($H_2O$)
C
Oxygen ($O_2$)
D
Carbon dioxide ($CO_2$)
Verified step by step guidance1
Understand the light-dependent reactions of photosynthesis: These reactions occur in the thylakoid membranes of chloroplasts and require light energy to produce ATP and NADPH, which are used in the light-independent reactions.
Identify the key inputs for the light-dependent reactions: The primary inputs are light energy, water ($H_2O$), and ADP + Pi (to form ATP). Water is split during photolysis to provide electrons, protons, and oxygen.
Eliminate incorrect options: Glucose ($C_6H_{12}O_6$) is a product of photosynthesis, not an input for the light-dependent reactions. Oxygen ($O_2$) is released as a byproduct during photolysis, not an input. Carbon dioxide ($CO_2$) is used in the Calvin cycle (light-independent reactions), not the light-dependent reactions.
Focus on water ($H_2O$): Water is essential for the light-dependent reactions because it provides electrons to replace those lost by chlorophyll in photosystem II during the process of photolysis.
Conclude that water ($H_2O$) is the correct input required for the light-dependent reactions of photosynthesis.
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