Practicing Success
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| Assertion : Pond ecosystems have inverted biomass pyramids . Reason : The pyramid of energy is also inverted in pond ecosystems . |
Assertion and Reason both are true and Reason is the correct explanation of the Assertion . Assertion and Reason both are true but reason is not the correct explanation of the assertion . Assertion is true but Reason is false. Both Assertion and reason are false. |
| Assertion is true but Reason is false. |
| The pyramid of biomass is inverted in a pond ecosystem. The biomass of phytoplankton is less as compared with that of the small herbivorous fish, that feed on these producers. The biomass of large carnivorous fish that depends on small fishes is still greater. Therefore, the pyramid of biomass is inverted in pond ecosystem. The pyramid of energy in an aquatic ecosystem is always upright because at each transfer about 80-90% of the energy available at a lower trophic level is used up to overcome its entropy and to perform metabolic activities. Only 10% of the energy is available to the next trophic level. |
