Multiple choice

What is the type of energy flow in an ecosystem?

  1. Unidirectional

  2. Bidirectional

  3. Multidirectional

  4. None of these
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A Correct answer
Explanation

Energy flow in ecosystems is unidirectional - it enters as sunlight and moves through trophic levels until lost as heat. Unlike nutrients which cycle and can be reused, energy cannot be recycled or flow backwards. This is why ecosystems need continuous energy input from the sun.

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