MCAS Biology Practice Test 2025 – Complete Exam Preparation

Question: 1 / 400

What role do autotrophs play in an ecosystem?

They consume other living organisms

They produce organic material for other organisms

Autotrophs play a crucial role in ecosystems as they are the primary producers. They convert inorganic substances, such as carbon dioxide and water, into organic material through processes like photosynthesis or chemosynthesis. This organic material serves as a food source for various organisms, especially heterotrophs, which cannot produce their own food and rely on the organic matter generated by autotrophs. In this way, autotrophs are foundational to the energy flow and nutrient cycling within an ecosystem, supporting the entire food web. Their ability to synthesize their own food allows them to maintain the energy balance necessary for sustaining life in the ecosystem.

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They break down waste products

They provide shelter for heterotrophs

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