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Multiple Choice

In a food web, what does the arrow from a producer to a primary consumer signify?

Energy flow through ecosystems is what this item tests. Producers capture sunlight and store energy as chemical energy; when a primary consumer eats that producer, energy moves to the consumer, and the arrow from producer to consumer shows that transfer. This arrow indicates the direction of usable energy moving through the food web, not just the act of predation, nor the cycling of nutrients or a specific carbon exchange. Keep in mind that a lot of energy is lost as heat at each step, so energy available decreases as you move up trophic levels.

Energy flow through ecosystems is what this item tests. Producers capture sunlight and store energy as chemical energy; when a primary consumer eats that producer, energy moves to the consumer, and the arrow from producer to consumer shows that transfer. This arrow indicates the direction of usable energy moving through the food web, not just the act of predation, nor the cycling of nutrients or a specific carbon exchange. Keep in mind that a lot of energy is lost as heat at each step, so energy available decreases as you move up trophic levels.