Egested waste,
All of the mass of the ingested grass is not accounted for in the growth and
waste of herbivore 1. How much is missing? What do you think happened to the
mass?
Nyour answer

Only 10% of the mass and energy is transferred

Explanation:

In a food chain, organism at a certain trophic level, obtain nutrition and energy from organism lying at its preceding trophic level.  

As per the rule of energy pyramid, a higher organism feeding on any low level organism in a given food chain obtain only 10% of the total energy. The remaining 90% of the energy remains with the organism to carry out its metabolic processes including decomposition or self destruction.