The energy in most ecosystems flows from producers to consumers. Which statement best describes this flow?

• A. Producers convert energy to minerals
• B. Consumers convert solar energy to chemical energy
• C. Producers convert solar energy into chemical energy through photosynthesis, forming the base of the food chain
• D. Decomposers produce energy from sunlight

Answer: (C)

Energy in ecosystems starts with producers capturing sunlight and turning it into chemical energy stored in sugars through photosynthesis. This chemical energy becomes the fuel that supports all other organisms, as consumers eat producers or other consumers to obtain energy. Because energy flows in one direction—from sunlight to producers to consumers—with some energy lost as heat at each step, producers form the base of the food chain.

The correct description fits this idea: producers use sunlight to create chemical energy, establishing the starting point of the food chain. The other statements mix up who captures energy, or what energy is used for, or what decomposers do, so they don’t describe how energy moves through an ecosystem.