Question

organisms usually follow the 10% rule, however sometimes it is a little more or a little less. calculate the percentage of energy transferred from the grass to the grasshopper.

Explanation:

Step1: Assume energy in grass is \(100\%\)

If we consider the energy in grass as the base value of \(100\%\) (for simplicity of calculation as it's a percentage - based energy transfer problem).

Step2: Apply the \(10\%\) rule

The formula for energy transfer from one trophic level to the next is \(E_{next}=E_{current}\times10\%\). Here, grass is the first trophic level (\(E_{grass} = 100\%\)) and grasshopper is the second trophic level. Using the formula \(E_{grasshopper}=E_{grass}\times10\%=100\%\times\frac{10}{100}=10\%\). But since it can be a little more or less, and among the given options \(12\%\) is closest to the \(10\%\) rule (allowing for some natural variation).

Answer:

12%