Question

define food chain . design a terrestrial food chain of four trophic levels​

Answer 1

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FOOD CHAIN

A series of organisms each dependent on the next as a source of food.

Example—

Grass-rabbit-snake-eagle

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Answer 2

 Aseries of organisms interrelated in their feeding habits, the smallest being fed upon by a larger one, which in turn feeds a still larger one, etc is a food chain.

Food chain, in ecology, the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant. Plants, which convert solar energy to food by photosynthesis, are the primary food source. In a predator chain, a plant-eating animal is eaten by a flesh-eating animal. In a parasite chain, a smaller organism consumes part of a larger host and may itself be parasitized by even smaller organisms. In a saprophytic chain, microorganisms live on dead organic matter.

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