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प्रश्न
Write a short note on pyramid of numbers and pyramid of biomass.
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उत्तर
Pyramid of Number
- Pyramid of number deals with number of individuals in a trophic level.
Pyramid of numbers in a grassland ecosystem. Only three top carnivores are supported in an ecosystem based on production of nearly 6 millions plants
- In Grassland ecosystem only 3 top carnivores are supported in an ecosystem based on production of nearly 6 million plants.
- Pyramid of number in grassland or forest or pond ecosystem is upright.
- In parasitic food chain, the pyramid of number is inverted.
- In an ecosystem dominated by trees, the pyramid of number shaped/inverted.
- Among the grassland, pond and forest ecosystem, the number of primary producers per unit area would be maximum in the pond ecosystem.
Pyramid of Biomass
- Total amount of living material at various trophic level of a food chain is depicted by pyramid of biomass.
Pyramid of biomass shows a sharp decrease in biomass at higher trophic levels
- In most of the ecosystem, the pyramids of number and biomass are upright.
- In terrestrial ecosystem pyramid of biomass is generally upright.
- The pyramid of biomass in the sea or lake is generally inverted because the biomass of fishes exceeds that of phytoplankton.
Inverted pyramid of biomass-small standing crop of phytoplankton supports large standing crop of zooplankton
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संबंधित प्रश्न
In an ecosystem dominated by trees, the pyramid (of numbers) is ______ type.
Distinguish between upright and inverted pyramids.
Explain energy pyramid
Which organisms constitute the last trophic level?
Answer the following question.
What is an ecological pyramid? Compare the pyramids of energy, biomass, and numbers.
Secondary consumers are __________.
Give an example of an ecosystem that shows an inverted pyramid of numbers.
Give an example of an ecosystem that shows an inverted pyramid of biomass.
Pyramid of energy in grassland and pond ecosystem is always ______.
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
Pyramid of biomass in terrestrial ecosystem shows sharp decline in
In an aquatic ecosystem, a mollusc typically belongs to-
Pyramid of numbers is ______.
What are the shortcomings of ecological pyramids in the study of ecosystems?
A graphic representation of the biomass relationship between the producer and consumer in an ecosystem is called ______.
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.
Give a scientific reason:
The pyramid of energy is always upright.
| In a forest ecosystem, a large population of insect feeds upon a banyan tree. Several small birds feed upon these insects. The small birds are fed upon by big-sized birds. |
- With respect to this ecosystem, draw a pyramid for each biomass and a pyramid of number.
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If 20,000 Kcal energy is available at the level of insects, calculate the amount of energy available at the level of big-sized birds.
