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B
Unidirectional
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C
Bidirectional
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D
Circular
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Solution
The correct option is B Unidirectional The flow of energy in the ecosystem is unidirectional. The energy enters the plants (from the sun) through photosynthesis during the making of food. This energy is then passed on to the successive trophic levels in a food chain is only 10% and rest energy get lost as heat during transfer and life process.