Energy enters from the sun, flows through food chains and is lost as heat at each step.
Light is captured by producers; only about 1 percent of incident sunlight ends up as chemical energy. At each trophic level around 90 percent is lost as heat.
Energy is not recycled; it flows through and leaves as heat. Efficiency of use differs between ectotherms and endotherms.
Key idea: sunlight is the primary energy source for most ecosystems.
Energy enters from the sun, flows through food chains and is lost as heat at each step.
Energy Flow in Ecosystems is one of the 53 topics in Metabolism & Bioenergetics. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include ATP, Chemosynthesis, Photosynthesis vs Respiration.
Ecosystems need a constant supply of solar energy because energy cannot be recycled.
Energy Flow in Ecosystems is a Beginner topic, so no earlier topic is required. Other Beginner topics in Metabolism & Bioenergetics that pair well with it include Metabolism, Anabolism and Catabolism, ATP.
The closest topics to Energy Flow in Ecosystems are ATP, Chemosynthesis, Photosynthesis vs Respiration, Metabolism. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Energy Flow in Ecosystems. To practise the whole of Metabolism & Bioenergetics, use the Metabolism & Bioenergetics quiz.
Energy Flow in Ecosystems: Energy enters from the sun, flows through food chains and is lost as heat at each step. ATP: The cell's energy currency, whose phosphate bond hydrolysis powers work in the cell. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with ATP and explain the difference aloud. Finally, take the Metabolism & Bioenergetics quiz and come back to this page for any question you miss.
The cell's energy currency, whose phosphate bond hydrolysis powers work in the cell.
⚡ Metabolism & BioenergeticsBacteria at hydrothermal vents fix carbon using energy from inorganic chemical reactions.
⚡ Metabolism & BioenergeticsPhotosynthesis stores energy in glucose and releases oxygen; respiration releases that energy and consumes oxygen.
⚡ Metabolism & BioenergeticsThe sum of all chemical reactions in an organism, including anabolic building and catabolic breakdown.
⚡ Metabolism & Bioenergetics