On what is the pyramid of numbers based on?
(a) The energy at each trophic level
(b) Individuals in a trophic level
(c) Biomass content at each trophic level
(d) The area at each trophic level
This question was addressed to me in unit test.
My query is from Ecological Pyramids topic in portion Ecosystem of Biology – Class 12
Correct choice is (b) Individuals in a trophic level
To explain: The pyramid of numbers represents the number of individuals at each level (producers forming the base and top carnivores forming the tip). Depending upon the nature of the food chain, the pyramid is inverted or upright.