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

Pyramid of Numbers: This pyramid shows the number of individuals at different trophic levels. Producers are kept at the bottom of the pyramid; followed by primary consumers, secondary consumers and so on. In most of the cases, the shape of the pyramid upright. In some cases, this pyramid can be inverted in shape. 
Pyramid of Biomass: This pyramid shows the biomass (in terms of dry weight) at different trophic levels. Producers are kept at the bottom of the pyramid: followed by primary consumers, secondary consumers and so on. In most of the cases, the shape of the pyramid is upright. In some cases, this pyramid can be inverted in shape.