The diagram shows the flow of energy through an ecosystem. Photosynthesis is the gross
productivity. Producers lose some energy in respiration and the energy left is the net
productivity.
This can also be expressed as an equation:
Net Productivity (NP) = Gross Productivity (GP) – Respiration (R)
Some of the net productivity passes to herbivores.
Which calculation gives the proportion of net productivity passing to herbivores?
1 )
$\frac{{0.075}}{{1.75}}$
2 )
$\frac{{0.75}}{4}$
$\frac{{0.75}}{{1.75}}$
4 )
$\frac{{\left( {0.75 + \left. {0.075} \right)} \right.}}{{1.75}}$
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