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प्रश्न
Describe pyramid of energy with the help of diagram.
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उत्तर
- A pyramid of energy is always upright. It can never be inverted because when energy flows from a particular trophic level, only 10% passes on as net energy to the next trophic level, and a large amount of energy is always lost as heat at each step.
- In smaller food chains, more energy is available than in the longer food chains.
- There are chain limitations of ecological pyramids. It assumes a simple food chain, something that almost never exists in nature.
- It does not accommodate a food web. Moreover, saprophytes are not given any place in ecological pyramids, even though they play a vital role in the ecosystem.
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संबंधित प्रश्न
Distinguish between a food chain and a food web.
Explain with the help of labelled diagrams, the difference between an upright pyramid of biomass and an inverted pyramid of biomass.
Define ecological pyramids.
Which ecosystem has the maximum biomass?
Organisms at a higher trophic level have less energy available. Comment.
The number of trophic levels in an ecosystem are limited. Comment.
(a) Draw a pyramid of numbers where a large number of insects are feeding on the leaves of a tree. What is the shape of this pyramid?
(b) Will the pyramid of energy be also of the same shape in this situation? Give a reason for your response.
The biomass of a standing crop of phytoplankton is 4 kg/m2, which supports a large standing crop of zooplankton having a biomass of 11 kg/m2. This is consumed by small fishes having a biomass of 25 kg/m2, which are then consumed by large fishes with a biomass of 37 kg/m2.
Draw an ecological pyramid indicating the biomass at each stage and also name the trophic levels. Mention whether it is an upright or inverted pyramid.
In most ecosystems, which three ecological pyramids are upright?
Which organisms are not included in ecological pyramids even though they play a vital role in the ecosystem?
