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Energy flow through the trophic levels of an ecosystem is:

AReversible loop
BUnidirectional
CBidirectional
DCircular flow
Answer & Solution
Correct answer: B. Unidirectional
1. Energy captured by autotrophs never returns to the Sun. 2. The flow is unidirectional. 3. It diminishes at each level. _Source: syllabus Science, Chapter 15, Our Environment._
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