The energy flow in the ecosystem is important to maintain an ecological palance. In this context, answer the following: (i) Explain why the flow of energy at different levels in an ecosystem is unidirectional and non-cyclic? (ii) Why is the number of trophic levels in an ecosystem limited?

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Q: Primary productivity varies from ecosystem to ecosystem.Explain?

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Q: The mass of living material at a trophic level at a particular time is called as what?

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