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Consider the following statements about food chain
$I.$ The transfer of energy from producers to top consumers through a series of organisms is called food chain
$II.$ A food chain is always straight and proceeds in a progressive straight line
$III.$ In a food chain, there is unidirectional flow of energy from sun to producers and subsequently to series of different types of consumers
Which of the statements given above are correct?
$I\; and \;II$
$I \;and\; III$
$II\; and\;III$
$I, II\; and \;III$
Solution
A food chain is a sequence of populations or organisms of an ecosystem through which the food and its contained energy passes with each member becoming the food of later member of sequence. It is a single straight pathway through which food energy travels in the ecosystem. Energy flow in an ecosystem is always unidirectional or one way, i.e., Solar radiation. $\rightarrow$ Producers $\rightarrow$ Herbivores $\rightarrow$ Carnivores. It can not pass in the reverse direction
