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Select the formula for ecological efficiency.
$\frac{\text { Gross primary productivity }}{\text { Incident total solar radiatio }} \times 100$
$\frac{\text { Food energyassimilated }}{\text { Food energyingested }} \times 100$
$\frac{\text { Net primary productivity }}{\text { Gross primary productivity }} \times 100$
$\frac{\text { Energy $\in$biomass production at trophic level}}{\text { Energy $\in$biomass production at previoustrophic level }} \times 100$
Solution
Ecological efficiency or trophic level efficiency refers to the percentage of energy converted into biomass by a higher trophic level over the energy of food resources available at the lower trophic level. The formula is as follows:
Ecological efficiency
$\frac{\text { Energy $\in$biomass production at trophic level}}{\text { Energy $\in$biomass production at previoustrophic level }} \times 100$
