Explanation:

Organisms of a higher trophic level feeding on several types of organisms belonging to a lower trophic level constitute the food web.

Food chain is a series of organisms through which food energy flows in an ecosystem. Ecosystem constitutes of all the living beings of an area and non-living components of their environment. An ecological pyramid shows the feeding relationship between groups of organisms and also depicts the amount of biomass or energy present at various trophic levels in an ecosystem