As energy is lost at each trophic level, lesser and lesser energy is available for the organism at the next level as we go down the food chain.
Thus, food chains are naturally short. The shorter the food chain, the more energy is available to the final consumer because less energy is lost to the environment.
Hence, we say that shorter food chains are more efficient in energy transfer.
eg. more energy will be available to a man if he feeds directly on crop plants grown on a given area, rather than eating the cattle that feed on hos crop plants.
https://www.cbd.int/images/youth/food-chain.jpg
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