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प्रश्न
Write a short note on pyramid of numbers and pyramid of biomass.
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
APPEARS IN
संबंधित प्रश्न
Why the pyramid of energy is always upright? Explain.
Describe with examples of pyramids of number, and biomass.
“The pyramid of biomass is not always upright.” Explain the statement.
Secondary consumers are __________.
Distinguish between the upright and inverted pyramid of biomass.
In a pyramid of biomass, if the total dry weight (kgm-2) of primary produces is about 809, it well increases at tertiary consumer level up to ______.
Pyramid of biomass in terrestrial ecosystem shows sharp decline in
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.
Describe pyramid of energy with the help of diagram.
| 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.
