Multiple Choice
Which of the following lists the three main reactants required for photosynthesis in plants?
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9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
Which process in photosynthesis directly contributes to the carbon cycle by converting atmospheric \(\mathrm{CO_2}\) into organic molecules?
A
Calvin cycle
B
Glycolysis
C
Photolysis of water
D
Electron transport chain
Verified step by step guidance1
Understand the carbon cycle: The carbon cycle involves the movement of carbon through the atmosphere, organisms, and the environment. Photosynthesis plays a key role by converting atmospheric carbon dioxide (\(\mathrm{CO_2}\)) into organic molecules.
Identify the processes in photosynthesis: Photosynthesis consists of two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). Each stage has distinct functions.
Focus on the Calvin cycle: The Calvin cycle is the light-independent stage of photosynthesis. It directly uses atmospheric \(\mathrm{CO_2}\) and incorporates it into organic molecules, such as glucose, through a series of enzymatic reactions.
Compare other options: Glycolysis is a process in cellular respiration, not photosynthesis. Photolysis of water occurs in the light-dependent reactions and involves splitting water molecules, not \(\mathrm{CO_2}\). The electron transport chain is part of the light-dependent reactions and does not directly involve \(\mathrm{CO_2}\) conversion.
Conclude that the Calvin cycle is the correct answer: The Calvin cycle is the process in photosynthesis that directly contributes to the carbon cycle by converting atmospheric \(\mathrm{CO_2}\) into organic molecules.
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