Multiple Choice
Which compound provides the reducing power for the Calvin cycle reactions?
99
views
9. Photosynthesis
Calvin Cycle
Multiple Choice
Which of the following best describes the primary function of the Calvin cycle in photosynthesis?
A
It splits water molecules to release oxygen.
B
It absorbs light energy to excite electrons in chlorophyll.
C
It converts carbon dioxide into glucose using ATP and NADPH.
D
It generates ATP through oxidative phosphorylation.
Verified step by step guidance1
Step 1: Begin by understanding the context of the Calvin cycle, which is part of photosynthesis. Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The Calvin cycle is also known as the dark reactions because it does not directly require light.
Step 2: Recall that the Calvin cycle takes place in the stroma of the chloroplast and uses ATP and NADPH produced during the light-dependent reactions. These molecules provide the energy and reducing power needed for the cycle.
Step 3: Understand the primary function of the Calvin cycle. Its main role is to fix carbon dioxide (CO₂) from the atmosphere into organic molecules. This process is called carbon fixation, and it ultimately leads to the production of glucose, a sugar molecule.
Step 4: Clarify that the Calvin cycle does not involve splitting water molecules (this occurs in the light-dependent reactions), absorbing light energy (also part of the light-dependent reactions), or generating ATP through oxidative phosphorylation (a process that occurs in cellular respiration, not photosynthesis).
Step 5: Conclude that the correct description of the Calvin cycle's primary function is: 'It converts carbon dioxide into glucose using ATP and NADPH.' This highlights its role in synthesizing organic molecules essential for plant growth and energy storage.
Related Videos
Related Practice
