Grade 9 Ecology Practice Exam

Which statement best describes a primary producer?

An autotroph that makes its own food A heterotroph that eats other organisms An organism that decomposes organic matter An organism that preys on other animals

Correct Answer:

An autotroph that makes its own food

Explanation:

Primary producers are autotrophs that make their own food using energy from light or inorganic chemical energy. They convert inorganic molecules like carbon dioxide into organic compounds, forming the base of the food web and supplying energy for all other organisms. This distinguishes them from heterotrophs, which must eat other organisms, and from decomposers or predators, which rely on organic matter produced by others. So the best description is an autotroph that makes its own food.

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