The upright pyramid of number cannot be seen with ecosystem.

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ALake

BGrassland

CPond

DForest

Answer:

Pyramid of numbers represents the number of individuals per unit area at various trophic levels.
It is always upright in grassland, pond and lake ecosystems.
But in a forest, it is a partly upright pyramid of numbers because the number of producers are lesser in number and support a greater number of herbivores and which in turn support a fewer number of carnivores.

Related Questions:

With reference to an initiative called ‘The Economics of Ecosystems and Biodiversity (TEEB)’ which of the following statements is/are correct ?

It is an initiative hosted by UNEP/IMF and World Economic Forum
It is a global initiative that focuses on drawing attention to the economic benefits of biodiversity.
It presents an approach that can help decision makers recognize, demonstrate and capture the value of ecosystem and biodiversity.