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Question
A spindle-shaped pyramid of number is seen in __(1)__ and an inverted pyramid of biomass is seen in __(2)__.
A spindle-shaped pyramid of number is seen in __(1)__ and an inverted pyramid of biomass is seen in __(2)__.
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Solution
The correct option is C (1) Tree, (2) Aquatic ecosystem
In a tree ecosystem, a single huge tree can support, thousands of herbivores in the form of insects, caterpillars, flies, small birds etc. Carnivorous birds feed on the herbivores which are smaller in number than the herbivores. Thus the pyramid of number in a tree ecosystem will be spindle-shaped.
Pyramid of biomass in aquatic ecosystem is inverted because in the lakes, a food chain typically starts with phytoplankton and ends with predatory fishes. Phytoplankton although at the lowest trophic level and form the base, they have the least biomass and the biomass increases with the small fishes at the next trophic level and the larger predatory fishes at the pointy part of the pyramid.
In a tree ecosystem, a single huge tree can support, thousands of herbivores in the form of insects, caterpillars, flies, small birds etc. Carnivorous birds feed on the herbivores which are smaller in number than the herbivores. Thus the pyramid of number in a tree ecosystem will be spindle-shaped.
Pyramid of biomass in aquatic ecosystem is inverted because in the lakes, a food chain typically starts with phytoplankton and ends with predatory fishes. Phytoplankton although at the lowest trophic level and form the base, they have the least biomass and the biomass increases with the small fishes at the next trophic level and the larger predatory fishes at the pointy part of the pyramid.
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