Praxis Agriculture (5701) Practice Exam

Which term describes a water-based ecosystem?

Terrestrial ecosystem Biomes Point source pollution Aquatic ecosystem

Correct Answer:

Aquatic ecosystem

Explanation:

Focus on the medium that supports life. A water-based ecosystem is defined by water being the dominant environment in which living organisms live, feed, and reproduce. When water is the key medium—whether freshwater or saltwater—the system is described as aquatic. These ecosystems include lakes, rivers, oceans, wetlands, and estuaries, with organisms adapted to living in water. By contrast, terrestrial refers to land-based ecosystems, which is the opposite. Biomes are broad classifications that can encompass both aquatic and terrestrial environments, so they’re not specifically about water-based systems. Point source pollution describes a pollution origin, not an ecosystem type. So the term that best fits a water-based ecosystem is aquatic ecosystem.

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