Multiple Choice
Which process in the carbon cycle is primarily responsible for converting atmospheric $\mathrm{CO_2}$ into organic molecules in plants?
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9. Photosynthesis
Introduction to Photosynthesis
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The Sun shines by _______ reactions.
A
chemical combustion
B
photosynthetic
C
nuclear fission
D
nuclear fusion
Verified step by step guidance1
Understand the question: The problem is asking about the type of reaction that powers the Sun and provides its energy.
Recall the concept: The Sun generates energy through nuclear reactions occurring in its core. Specifically, it involves the fusion of hydrogen nuclei into helium.
Differentiate the options: Chemical combustion involves the reaction of substances with oxygen to release energy, which is not sufficient to power the Sun. Photosynthesis is a biological process in plants, not applicable to the Sun. Nuclear fission involves splitting heavy atomic nuclei, which is not the process occurring in the Sun.
Focus on nuclear fusion: In the Sun, nuclear fusion occurs when hydrogen nuclei (protons) combine under extreme pressure and temperature to form helium, releasing a tremendous amount of energy in the process.
Conclude: The correct answer is nuclear fusion, as it is the process responsible for the Sun's energy production.
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