Question

Differentiate between the pyramid of energy and the pyramid of numbers.

Answer 1

Sr. No.	Pyramid of Energy	Pyramid of Numbers
1.	Shows the rate of energy flow and productivity at successive trophic levels.	Shows the number of organisms at successive trophic levels.
2.	Always upright because energy decreases at each level due to energy loss as heat.	It can be upright or inverted depending on the ecosystem and the size of the organisms.
3.	Does not get distorted by the size or weight of individuals.	The size of organisms is not considered; hence, shape may not always be a true pyramid.
4.	Represents energy transfer efficiency between trophic levels.	Represents the count of individuals only, regardless of biomass or energy.
5.	Energy is lost as heat at each transfer, so energy decreases with each level.	Difficult to count all organisms, especially in complex ecosystems.
6.	Provides a better understanding of ecosystem functioning through energy flow.	It may be inverted in parasitic food chains or forests where large producers support many consumers.