Multiple Choice
In a plant, which of the following reactions produces molecular oxygen ($\mathrm{O_2}$)?
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9. Photosynthesis
Introduction to Photosynthesis
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In which photosystem is water split to provide electrons during the light-dependent reactions of photosynthesis?
A
Photosystem I
B
ATP Synthase Complex
C
Calvin Cycle
D
Photosystem II
Verified step by step guidance1
Understand that photosynthesis consists of two main stages: the light-dependent reactions and the Calvin Cycle. The light-dependent reactions occur in the thylakoid membranes of the chloroplast and involve two photosystems: Photosystem I (PSI) and Photosystem II (PSII).
Recall that Photosystem II (PSII) is the first photosystem in the sequence of the light-dependent reactions. It is responsible for capturing light energy to excite electrons and initiate the electron transport chain.
Recognize that water (H₂O) is split in a process called photolysis at Photosystem II. This process provides electrons to replace those lost by the chlorophyll molecules in PSII after they are excited by light energy.
Understand the chemical reaction for the splitting of water: . This reaction produces protons (H⁺), electrons (e⁻), and oxygen (O₂) as a byproduct.
Conclude that Photosystem II is the correct answer because it is the photosystem where water is split to provide electrons during the light-dependent reactions of photosynthesis.
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