Pyramid of numbers is? (1) Always upright (2) Always inverted (3) Either upright or inverted (4) Neither upright nor inverted

Answer: (3)

Pyramid of the number shows the number of species per trophic stage. The pyramid of numbers is usually upright except for some situations like that of the detritus food chain, where many organisms feed on one dead plant or animal and the pyramid of biomass is also upright except in oceans where large numbers of zooplanktons depend on a small number of phytoplanktons. In the parasitic food chain, the pyramid of numbers is inverted. In this case, the primary producers are plants which are least in the number followed by primary consumers that are herbivores. Secondary consumers are parasites. The maximum number of individuals present in the top of the trophic stage that is hyperparasites.

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