Multiple Choice
Which two biological processes are primarily responsible for fueling the carbon cycle?
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9. Photosynthesis
Introduction to Photosynthesis
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Which statement best describes what a thylakoid does during photosynthesis?
A
It is the site where the light-dependent reactions occur, producing ATP and NADPH.
B
It transports water from the roots to the leaves.
C
It stores glucose produced during the Calvin cycle.
D
It releases oxygen by breaking down glucose.
Verified step by step guidance1
Understand the role of the thylakoid in photosynthesis: The thylakoid is a membrane-bound structure within chloroplasts where the light-dependent reactions of photosynthesis occur.
Recall the light-dependent reactions: These reactions use light energy to produce ATP and NADPH, which are essential for the Calvin cycle (light-independent reactions).
Clarify the incorrect options: The thylakoid does not transport water from roots to leaves (this is the role of xylem), nor does it store glucose (glucose is synthesized in the stroma during the Calvin cycle).
Explain oxygen release: Oxygen is released during the light-dependent reactions in the thylakoid as a byproduct of water splitting, not by breaking down glucose.
Conclude: The correct description of the thylakoid's function is that it is the site of light-dependent reactions, producing ATP and NADPH.
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