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Multiple Choice
Why is it important for carbon dioxide molecules from the atmosphere to enter the Calvin cycle in plants?
A
To fix carbon into organic molecules for energy storage
B
To release energy directly into the atmosphere
C
To convert sunlight into chemical energy
D
To provide oxygen for cellular respiration
Verified step by step guidance
1
Understand the role of the Calvin cycle: The Calvin cycle is a series of biochemical reactions that take place in the stroma of chloroplasts in photosynthetic organisms. It is a crucial part of photosynthesis where carbon fixation occurs.
Identify the process of carbon fixation: Carbon fixation is the process of converting inorganic carbon (CO2) from the atmosphere into organic compounds. This is essential for building the carbon skeletons of organic molecules.
Recognize the importance of carbon dioxide: Carbon dioxide is the source of carbon for the Calvin cycle. It is incorporated into organic molecules, which are then used to store energy in the form of glucose and other carbohydrates.
Connect the Calvin cycle to energy storage: The organic molecules produced in the Calvin cycle, such as glucose, serve as energy storage molecules. These molecules can be used by the plant for growth, development, and energy during cellular respiration.
Clarify the misconception: The Calvin cycle does not release energy directly into the atmosphere, convert sunlight into chemical energy (this is done in the light-dependent reactions), or provide oxygen for cellular respiration (oxygen is a byproduct of the light-dependent reactions). Its primary role is to fix carbon into organic molecules for energy storage.