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# Identify the incorrect statement from the following-A. Pyramid of energy is always upright.B. Pyramid of number and biomass is always upright.C. Pyramid of biomass in a sea is generally inverted as the biomass of fish far exceeds that of phytoplankton. D. Food chains are generally short with few trophic levels as only 10% of energy is transferred to each trophic level from the lower trophic level.

Last updated date: 14th Sep 2024
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Ecological pyramids depict the feeding patterns of organisms graphically, in different ecosystems. Each bar represents a different trophic level and these are further of different types depicting the interrelation or the direction of flow.

The pyramid of numbers and biomass is always upright is false. The pyramid of numbers and biomass is not always upright but can be inverted also.
Ecological pyramids depict a graphical representation of the feeding patterns of organisms in different ecosystems. Each bar represents the trophic level. It is further of three different types-
* Pyramid of Number- It depicts the number of organisms in each trophic level and size is considered. It can be upright(grassland ecosystem of pond ecosystem), partially upright or spindle-shaped(Forest ecosystem), and inverted(parasitic food chain).
* Pyramid of biomass- It indicates the total mass of an organism in each trophic level. It can be upright (Forests and grassland) or inverted (Aquatic ecosystem for eg- the biomass of fish far exceeds that of phytoplankton).
* Pyramid of energy- It is the fundamental of all and denotes the total amount of energy at each trophic level. It is always upright and vertical.
Then, we also know about the 10% law(during the transfer of energy from one trophic level to another only 10 % energy is stored), so food chains are generally short with few trophic levels as only 10% of energy is transferred to higher trophic level, rest of the energy is lost to the environment.

The correct option is (B).

Note: Remember the following points-
These ecological pyramids are also known as Eltonian Pyramids .
Also there is a difference between food chains and food webs.
The pyramids have no space for detritivores and decomposers.