Choose the correct option from the below about food chain: i) The flow of energy is not unidirectional in food chain. ii) The size of any food chain is usually restricted to 3-5 trophic levels. iii) For food chains to sustain, the inorganic nutrients must keep circulating. iv) As the trophic levels increases, the size of the population decreases.

In a food chain energy is always transferred from one trophic level to the next one i.e. from 1st trophic level to 2nd trophic level and in same way to 3rd and 4th.

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