HARD
Earn 100
Explain the concept of pyramid of numbers.
Important Questions on Ecosystem
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Give a reason for each of the following:
The shape of the pyramid of biomass in an aquatic ecosystem is inverted.
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(i) The trophic relationship is expressed in terms of numbers, biomass or energy arranged one on the top of its lower trophic level, resulting in a pyramid shape.
(ii) The base of each pyramid represents producers, while the apex represents the top order consumers.
(iii) The pyramid of biomass in sea is generally upright.
(iv) In the case of parasite food chain, the pyramid of number is inverted.
(v) Some species belonging to two or more trophic levels is not limitation of ecological pyramid.
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Given below is data showing number of individuals and dry weight of different trophic levels in a grassland ecosystem. Construct:
Pyramid of number
| Trophic Level | Number of individuals | Dry weight (Kg m-2) |
| Primary Producer | 5,84,2000 | 809 |
| Primary consumer | 7,08,000 | 37 |
| Secondary consumer | 3.54,000 | 11 |
| Tertiary consumer | 3 | 1.5 |
MEDIUM
Given below is data showing number of individuals and dry weight of different trophic levels in a grassland ecosystem. Construct:
Pyramid of Biomass
| Trophic Level | Number of individuals | Dry weight (Kg m-2) |
| Primary Producer | 5,84,2000 | 809 |
| Primary consumer | 7,08,000 | 37 |
| Secondary consumer | 3.54,000 | 11 |
| Tertiary consumer | 3 | 1.5 |
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Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
