In energy flow, which statement is true?

In energy flow, which statement is true?

• A. Energy is created by producers.
• B. Energy cycles within a single trophic level.
• C. Energy remains stored in the form of biomass indefinitely.
• D. Energy flows from the sun to producers to consumers.

Answer: (D)

Energy flow in ecosystems moves in one direction—from the sun to producers and then to consumers. Plants capture sunlight and convert it into chemical energy stored in their biomass. When animals eat plants or other animals, they gain some of that energy, but at each transfer most energy is used for life processes or released as heat, so only a portion moves to the next level. Because energy is gained from the sun and then gradually lost as heat through metabolism, it doesn’t cycle within a single level or stay stored in biomass indefinitely. This path—sun to producers to consumers—best describes how energy moves through an ecosystem.

Energy flow in ecosystems moves in one direction—from the sun to producers and then to consumers. Plants capture sunlight and convert it into chemical energy stored in their biomass. When animals eat plants or other animals, they gain some of that energy, but at each transfer most energy is used for life processes or released as heat, so only a portion moves to the next level. Because energy is gained from the sun and then gradually lost as heat through metabolism, it doesn’t cycle within a single level or stay stored in biomass indefinitely. This path—sun to producers to consumers—best describes how energy moves through an ecosystem.