Why biomass of primary consumers in a food chain is considerably less than the biomass of primary producers?

The biomass of primary consumers is considerably less than that of primary producers due to the inefficiencies in energy transfer between trophic levels. According to the 10% rule of energy transfer, only about 10% of the energy stored in primary producers is converted into biomass by primary consumers, as much energy is lost through metabolic processes, respiration, and heat. Additionally, primary producers, such as plants, capture energy from the sun and convert it into chemical energy through photosynthesis, resulting in a larger overall biomass compared to the energy available for consumers.