Explanation:

Ecological Pyramid of Biomass – Inverted
In many aquatic ecosystems, the pyramid of biomass may assume an inverted form.

[Pyramid of numbers for aquatic ecosystem is upright].This is because the producers are tiny phytoplankton that grow and reproduce rapidly.Here, the pyramid of biomass has a small base, with the consumer biomass at any instant actually exceeding the producer biomass and the pyramid assumes inverted shape.

The Ten percent law is the transfer of energy from one trophic level to the next.According to this law, during the transfer of energy from organic food from one trophic level to the next, only about ten percent of the energy from organic matter is stored as flesh The remaining is lost during transfer, broken down in respiration, or lost to incomplete digestion by higher trophic level.
Suppose an ecosystem receives 1000 calories of light energy in a given day. Most of the energy is not absorbed; some is reflected back to space; of the energy absorbed only a
small portion is utilized by green plants, out of which the plant uses up some for respiration and of the 1000 calories, therefore only 100 calories are stored as energy rich materials.