Ontario Grade 9 Science Class Practice Exam

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What is a trophic level?

A classification of organisms based on their genetic similarities
Each of several hierarchical levels in an ecosystem comprising organisms that share the same function in the food chain
A type of ecosystem
The highest level of the food chain

The correct answer is: Each of several hierarchical levels in an ecosystem comprising organisms that share the same function in the food chain

A trophic level is a term used to classify organisms in an ecosystem based on their position in the food chain or food web. It refers to the role an organism plays in the transfer of energy and nutrients through the ecosystem. Option A is incorrect because trophic levels are based on an organism's role in the ecosystem, not their genetic similarities. Option C is incorrect because a trophic level is not a type of ecosystem, but rather a classification system within an ecosystem. Option D is incorrect because trophic levels can exist at any point in the food chain, not just the highest level.