Ohio 5th Grade Science OST Practice Test

In an ecosystem, what energy source do producers primarily use to make their own food?

Water Nutrients from soil Sunlight Oxygen

Correct Answer:

Sunlight

Explanation:

Producers get their energy from sunlight through the process of photosynthesis. Plants and algae use light energy captured by chlorophyll to power reactions that turn water and carbon dioxide into glucose, a type of stored chemical energy, while releasing oxygen. That stored energy in glucose then moves through the food web when consumers eat the plants. Water and nutrients from the soil are needed to grow, but they don’t provide the energy for making food. Oxygen is released as a byproduct, not the energy source. In most ecosystems, sunlight is the main energy input that starts this energy flow.

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