Pyramid
of Biomass is the graphic representation of biomass of the successive
trophic levels of an Eco system. Biomass refers to the total weight of
dry matter present in the ecosystem at anyone time. The pyramid of
biomass indicates the gradual reduction in biomass at each trophic level
from base to top. The total biomass of producers is much more than the
total biomass of herbivores. Like wise the total biomass of the third
level will be less than the herbivores and so on. The pyramid of biomass
are generally upright, but in case of parasites, the pyramid of biomass
is inverted. Similarly, if organisms of lower levels are much smaller
than those of higher levels, biomass pyramid may be inverted. 
Examples of Pyramid of Biomass.1
Pyramid of Biomass in a Marine ecosystem
In
the marine Eco system the Phytoplankton occupy the basic trophic level
and the next trophic level is occupied by the Zoo plankton, the third
and fourth are occupied by carnivores such as worms, and molluscs and
carnivores fishes respectively. Here too the biomass falls in a graded
manner from the basic trophic level to higher trophic level.
Examples of Pyramid of Biomass.2
Pyramid of Biomass in a grass land
In
a grass land the biomass of grasses is the maximum and it gradually
decreases towards the consumer level. That is the biomass is decrease
in this order. Grasses have higher biomass than that of snake and snake
have higher biomass than that of Hawk.
Grass ------------> Snake -------------> Hawk
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