Multiple Choice
Which of the following biological processes is NOT linked to the nitrogen cycle?
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52. Ecosystems
Biogeochemical Cycles
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Which of the following is a compound that is cycled through an ecosystem?
A
Glucose (C$_6$H$_{12}$O$_6$)
B
Water (H$_2$O)
C
Methane (CH$_4$)
D
Sodium chloride (NaCl)
Verified step by step guidance1
Understand the concept of biogeochemical cycles: These are pathways by which chemical substances move through both biotic (living) and abiotic (non-living) components of Earth. Examples include the water cycle, carbon cycle, nitrogen cycle, and phosphorus cycle.
Identify the compounds listed in the problem: Glucose (C₆H₁₂O₆), Water (H₂O), Methane (CH₄), and Sodium chloride (NaCl). Determine if each compound is part of a major biogeochemical cycle.
Analyze Water (H₂O): Water is a key component of the water cycle, which involves processes like evaporation, condensation, precipitation, and infiltration. It is cycled continuously through ecosystems.
Evaluate the other compounds: Glucose (C₆H₁₂O₆) is an organic molecule used in cellular respiration and photosynthesis but is not cycled through ecosystems in the same way as water. Methane (CH₄) is involved in the carbon cycle but is not cycled as extensively as water. Sodium chloride (NaCl) is a salt and does not participate in a major biogeochemical cycle.
Conclude that Water (H₂O) is the correct answer because it is a compound that is cycled extensively through ecosystems via the water cycle.
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