Multiple Choice
How does water rise from the roots of a redwood tree to the very top?
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9. Photosynthesis
Introduction to Photosynthesis
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During photosynthesis, the production of one molecule of $\mathrm{O_2}$ requires how many chlorophyll molecules to be involved in the light reactions?
A
2 chlorophyll molecules
B
6 chlorophyll molecules
C
8 chlorophyll molecules
D
4 chlorophyll molecules
Verified step by step guidance1
Understand the context of the problem: Photosynthesis involves light reactions where chlorophyll molecules absorb light energy to drive the production of oxygen ($\mathrm{O_2}$) and other products.
Recall that during the light reactions, chlorophyll molecules are part of the photosystems (Photosystem I and Photosystem II) that capture light energy and transfer electrons through the electron transport chain.
Each molecule of $\mathrm{O_2}$ produced requires the splitting of two water molecules ($\mathrm{H_2O}$) in Photosystem II, which releases four electrons. These electrons are transferred through the chain, requiring the involvement of multiple chlorophyll molecules.
Note that the production of one molecule of $\mathrm{O_2}$ typically involves four chlorophyll molecules actively participating in the light reactions to absorb and transfer the necessary energy.
Conclude that the correct answer is based on the mechanism of light absorption and electron transfer, where four chlorophyll molecules are involved in the production of one molecule of $\mathrm{O_2}$ during photosynthesis.
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