Assertion : Sea ecosystems have inverted biomass pyramids .
Reason : The pyramid of energy is also inverted in pond ecosystems .

Assertion is true but Reason is false.

The correct answer is Option (3) → Assertion is true but Reason is false.

The green plant in the ecosystem are called producers. In a terrestrial ecosystem, major producers are herbaceous and woody plants. Likewise, producers in an aquatic ecosystem are various species like phytoplankton, algae and higher plants

The pyramid of biomass in the sea is often inverted due to the higher biomass of fishes compared to phytoplankton. Phytoplankton, which are microscopic photosynthetic organisms, serve as the primary producers in marine ecosystems. They convert sunlight and nutrients into organic matter and form the base of the food chain. The pyramid of biomass in sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton.The producers are smallest organisms while carnivores are large in size. Consequently , there is a gradual increase in biomass of organisms at successive trophic levels from producers onwards to top carnivores resulting in inverted pyramid. Thus, the biomass of phytoplanktons will be smaller than that of zooplanktons; the biomass of zooplanktons will be lesser than of primary carnivores ( e.g., small fishes).

The pyramid of energy always shows a standard upright shape, regardless of the ecosystem — including pond ecosystems.The pyramid of energy represents the flow of energy from one trophic level to the next in an ecosystem.At each trophic level, only about 10% of the energy is passed on, while the rest is lost as heat, used in metabolism, or excreted.Because of this energy loss, each higher level has less energy than the level below.