Answer:
An ecological pyramid is a graphic representation of an ecological parameter, like number of individuals present in various trophic levels of a food chain with producers forming the base and top carnivores at the tip.
Pyramid of numbers: Pyramid of numbers can have both erect and inverted shapes. In a grassland ecosystem, number of grasses are maximum. The herbivores feeding on them are less in numbers. Carnivores like tiger, wolf, etc., are still fewer. In this way, pyramid is erect.
On the other hand, in a forest ecosystem, the pyramid is inverted. The number of trees occurs at the base. Birds and other arboreal animals are far more than the number of trees. The insects and other small animals occurring as parasites on herbivores is far more than the herbivores. In this way, the pyramid becomes inverted.
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