Organisms living in open sea are called

A rat feeding upon potato tuber is

The number of individuals in each trophic level depends upon

Only a small amount of the energy stored in food is available to the next organism in a food chain because

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?

In a pond ecosystem, benthos means