Which Environment and Ecology term is correctly identified by “a functional unit of organisms and their physical environment” and “biotic and abiotic components interact within it”?

Correct Answer: Option A — Ecosystem. Ecosystem is correct because it is a functional unit of organisms and their physical environment. Ecosystem is also specifically associated with biotic and abiotic components interact within it. Two additional identifying facts are that Ecosystem is energy flows while nutrients cycle through the system and Ecosystem is associated with a pond, forest or grassland can be studied as an ecosystem. Why the other options are incorrect: • Option B — Food Chain: Food Chain is a linear sequence showing transfer of food energy. It is incorrect here because its separate identifying association is producers form the base of most grazing food chains. • Option C — Biodiversity Hotspot: Biodiversity Hotspot is a region combining exceptional endemism with severe habitat loss. • Option D — Wetland: Wetland is land where water controls ecological conditions for significant periods. It is incorrect here because its separate identifying association is marshes, floodplains, lakeshores and mangrove areas can be wetlands. Exam Takeaway: Connect Ecosystem with “a functional unit of organisms and their physical environment” and “biotic and abiotic components interact within it”.