Define ecological pyramids and describe with examples, pyramids of number and biomass.

Explanation

An ecological pyramid may be defined as a graphical representation of the number or biomass or status of accumulated energy at different trophic levels in a food chain in an ecosystem .
a. Pyramid of numbers : A pyramid of numbers is the graphical representation depicting the arrangement of number of individuls of different trophic level in a food chain in an ecosystem . The pyramid of numbers is found in animal communities . The shape of the pyramids may be upringht . e.g. Food chain in a grassland ecosystem or pond ecosystem and inverted . e.g. Parasitive food chain .
b. Pyramid of biomass : Pyramid of biomass is a graphical representation of biomass present per unit area in different trophic levels . e.g. Grassland and forest ecosystem .