i. The food chain in an ecosystem indicates food relationships among living organisms.

ii. The food chain is represented by arrows between the food and the consumer.

iii. Food chain also indicates the flow of energy from one organism to another.

iv. The pyramid is the graphical representations of organisms at different trophic levels.

v. In the ecological pyramid, the producers occupy the base of the base (I tropic level) of the pyramid and the other successive tropic levels (primary, secondary and top consumers) are represented one above the other with top carnivores at the tip.