Discussion
In an ecosystem.........requires maximum energy.
Answer: A
The keyed answer is the Primary producer.
All the energy that flows through an ecosystem enters at the producer level, where plants capture solar energy in photosynthesis. Producers have the largest energy budget of any trophic level: much of their gross production is spent on their own respiration, and only about 10 percent of the energy at one level passes to the next (Lindeman's ten percent rule).
Primary consumers receive only part of the producers' net production, secondary consumers about a tenth of that again, so each higher level handles less energy. Decomposers process dead matter from all levels, but the energy they use is itself only a fraction of what producers originally captured.
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