Write a short note on pyramid of numbers and pyramid of biomass.

Explanation

Ecological pyramids are graphical representations of the relationship between organisms of different trophic levies that can be expressed in terms of numbei. biomass or energy. 
In most ecosystems. the pyramid of number is upright, i.e., producers are more in number than the herbivores and herbivores are more in number than the carnivores. But, the pyramid of number may be inverted as in a forest ecosystem, where the number of insects (primary consumers) are greater than the number of trees (producers). 
The pyramid of biomass is upright. generaliy. as the biomass of producers is more than biomass of herbivores and that of herbivores is more than biomass of carnivores. But. it is inverted in ecosystems like sea ecosystem. where the biomass of fishes (primary consumers) exceeds than phytoplankton (producers).