Which term describes the function a species serves in its ecosystem?

Which term describes the function a species serves in its ecosystem?

• A. Ecological niche
• B. Biosphere
• C. Nitrogen cycle
• D. Herbivore

Answer: (A)

Think about what a species does in its environment—the role it plays, including how it gets energy, what resources it uses, and how it affects other organisms and the habitat. That overall function is described by the ecological niche. It covers where the species lives, what it eats, when it’s active, and how it interacts with predators, prey, competitors, and mates. This combined role explains how the species fits into energy flow and material cycling in the ecosystem. The other terms don’t capture that full role. The biosphere is the global system of all ecosystems, not the function of a single species. The nitrogen cycle is the set of processes moving nitrogen through environment and organisms. A herbivore describes a feeding habit, not the complete role a species plays in its ecosystem.

Think about what a species does in its environment—the role it plays, including how it gets energy, what resources it uses, and how it affects other organisms and the habitat. That overall function is described by the ecological niche. It covers where the species lives, what it eats, when it’s active, and how it interacts with predators, prey, competitors, and mates. This combined role explains how the species fits into energy flow and material cycling in the ecosystem.

The other terms don’t capture that full role. The biosphere is the global system of all ecosystems, not the function of a single species. The nitrogen cycle is the set of processes moving nitrogen through environment and organisms. A herbivore describes a feeding habit, not the complete role a species plays in its ecosystem.