Which one of the following is the correct sequence of a food chain ........

Environment and Ecology Concept of Ecosystems

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Which one of the following is the correct sequence of a food chain ?

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UPSC CSP Previous Year Paper (2014)

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Diatoms-Crustaceans-Herrings

Crustaceans-Diatoms-Herrings

Diatoms-Herrings-Crustaceans

Crustaceans-Herrings-Diatoms

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Explanation:

Food chains are directional paths of trophic energy or, equivalently, sequences of links that start with basal species, such as producers or fine organic matter, and end with consumer organisms.

Crustaceans are herbivorous animals which feed on diatoms. Herrings are carnivorous animals which feed on Crustaceans. This completes the food chain. Diatoms are autotrophs, prepare their own food.