Correct Answer - D
Ecological pyramids are the graphical respresentation of the trophic structures and function at successive trophic levles. Ecological pyramids are of three general types , liseted as here under .
(a) Pyramid of biomass , showing the total dry weight of living matter .
(c ) Pyramid of energy , showing the rate of energy flow/productivity at successive trophic levels .
Thus , fresh weight is not used for the construction of ecological pyramids.
