Primary source of energy in an ecosystem is

Sugar stored in plants

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Heat liberated during respiration

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Solar energy

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Heat liberated during fermentation

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Solution

The correct option is B Solar energy
The fundamental source of energy in almost all ecosystems is radiant energy from the sun. Photoautotrophs use this solar energy to prepare food. While all other organisms depend on autotrophs for their food directly or indirectly.

Therefore, the correct answer is option C.

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