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Solution:
The correct option is (3).
Pyramid of energy is the only type of ecological pyramid, which is always upright because the energy flow in a food chain is always unidirectional. Also, with every increasing trophic level, some energy is lost in the environment and never goes back to the sun. It is the best representation of an ecosystem and is most efficient.
The pyramid of biomass in the sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton.
The correct option is (3).
Pyramid of energy is the only type of ecological pyramid, which is always upright because the energy flow in a food chain is always unidirectional. Also, with every increasing trophic level, some energy is lost in the environment and never goes back to the sun. It is the best representation of an ecosystem and is most efficient.
The pyramid of biomass in the sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton.