When a grasshopper consumes grass, it does not recover all the energy available in the grass. This is because energy transfer between trophic levels in an ecosystem is typically not very efficient.
At each trophic level, energy is lost due to various biological processes like respiration, movement, and metabolic heat. On average, about 90% of the energy is lost at each step from one trophic level to the next. Consequently, only a fraction of the energy is passed on to the next level.
In this case, when a grasshopper eats grass, it recovers only about 10% of the original energy found in the grass. This means that the efficiency of energy transfer from the grass (the producer) to the grasshopper (the primary consumer) is approximately 10%.
Hence, the answer is:
[tex]$10\%$[/tex]
