Question

Why do food chains generally consists of three or four steps only?

Answer 1

This is because of 10% law.The other organisms in the food chain are consumers – they all get their energy and biomass by consuming (eating) other organisms. Most food chains are quite short, and they rarely consist of more than four steps. This is because a lot of energy is lost at each step

Answer 2

There is a loss of 10% energy at each trophic level of a food chain. Hence food chain consists of 3 or 4 levels only.

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