Multiple Choice
In a typical terrestrial food web, which organisms can function as both secondary and tertiary consumers depending on their diet?
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48. Ecology
Introduction to Ecology
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How do freshwater and saltwater compare in terms of their dissolved solids?
A
Saltwater contains a much higher concentration of dissolved solids than freshwater.
B
Freshwater contains more dissolved solids than saltwater.
C
Both freshwater and saltwater have approximately the same concentration of dissolved solids.
D
Neither freshwater nor saltwater contains any dissolved solids.
Verified step by step guidance1
Understand the concept of dissolved solids: Dissolved solids refer to minerals, salts, and organic matter dissolved in water. These are typically measured as Total Dissolved Solids (TDS).
Compare freshwater and saltwater: Freshwater generally has a low concentration of dissolved solids, typically less than 1,000 milligrams per liter (mg/L). Saltwater, such as ocean water, has a much higher concentration of dissolved solids, often around 35,000 mg/L due to the presence of salts like sodium chloride (NaCl).
Analyze the options provided: Evaluate each statement based on the known concentrations of dissolved solids in freshwater and saltwater. Saltwater contains significantly more dissolved solids than freshwater, making the first option correct.
Eliminate incorrect options: Freshwater does not contain more dissolved solids than saltwater, and the concentrations are not approximately the same. Additionally, it is incorrect to say that neither contains dissolved solids, as both do.
Conclude the comparison: Saltwater has a much higher concentration of dissolved solids than freshwater due to its high salt content, which is the key distinguishing factor between the two types of water.
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