The upright pyramid of number is absent in: ( AIPMT- 2012 Pre) (A) Grassland (B) Pond (C) Forest (D) Lake
Option C. The pyramid of a number represents the number of individuals per unit area at various trophic levels. It is always upright in grassland, pond and lake ecosystems. But in the forest or single tree ecosystem, and if the parasitic food chain is considered, then it will be an inverted pyramid. Hence, the upright pyramid of number is absent in the forest.
