Explain why only about 10% of energy is transferred from one trophic level to the next
Pyramid of Energy
(Measured in Kj)
As you can see 100% producer, only 10% makes it into the primary consumer and only 1% of the 100% makes it into the secondary consumers.
This is because energy will be lost from respiration, not all of the 100% is actually available to the primary consumer, for example a mice cannot digest cellulose from plants which contains energy, and it will be lost in the form of faeces.