Biology Marking Period 3 Practice Test

Which option is not a direct definition provided for organ system or organism?

A group of organs working together to perform a function A living thing A single organ A living cell

Correct Answer:

A living cell

Explanation:

Understanding levels of biological organization helps explain this. An organ system is a group of organs working together to perform a function, and an organism is a living thing. Describing a single organ doesn’t define an organ system or an organism—it’s just one component, not the whole system or the whole living being. Describing a living cell isn’t a definition of either organ system or organism either, because it points to the cell level, the basic unit of life, which can be part of a larger organism but does not by itself define the entire system or the whole organism. So the statement about a living cell is the one that does not directly define an organ system or an organism.

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