With reference to food chains in ecosystems, consider the following statements:<br/>1. A food chain illustrates the order in which a chain of organisms feed upon each other.<br/>2. Food chains are found within the populations of a species.<br/>3. A food chain illustrates the numbers of each organism which are eaten by others.<br/><br/>Which of the statements given above is/are correct?

1. Correct. A food chain shows the feeding sequence in an ecosystem—who eats whom, from producers to consumers.
2. Incorrect. Food chains operate among different species/populations in a community, not within the population of a single species.
3. Incorrect. A food chain shows feeding relationships, not the number of organisms eaten; numbers are represented through ecological pyramids, especially the pyramid of numbers.

Therefore, only statement 1 is correct.