1. As we move from producers to different levels of consumers the energy available will decrease gradually.
2. Only ten per cent of the energy present in one tropic level transfer to another tropic level.
3. Biomass also decreases gradually as only 10 – 20% of the biomass is transferred from one tropic level to the next in a food chain.
4. As there is less energy & less biomass available at top levels, number of organisms also less, generally.
5. So, the number of organisms get decreased as we move from producer to different level of consumers.
