7.4 Trophic levels in an ecosystem (biology only)

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Question 17
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Figure 1 shows the flow of energy through an agricultural food chain consisting of corn and a pig. The numbers are in kilojoules/m2\text{m}^2m2/year.

A diagram showing the flow of energy from sunlight to corn and then to a pig. Sunlight energy input of 2,400,000 units goes into the Corn box. The Corn box shows Growth of 31,200. Arrows also point from Corn to Decomposers and other herbivores. An arrow labelled 'Food eaten' with value 5,500 points from the Corn to the Pig box. The Pig box shows a pig eating with 'Growth' of 410 inside the box. Arrows point out of the Pig box for Respiration with value 1,890 and Faeces with value 3,200.

The pig is more efficient than the corn at converting energy.

The energy conversion efficiency of the pig is 7.45%7.45\%7.45%.

Calculate how many times more efficient the pig is at converting energy than the corn.

The equation for energy conversion efficiency is: energy conversion efficiency=energy used for growthenergy input×100\text{energy conversion efficiency} = \frac{\text{energy used for growth}}{\text{energy input}} \times 100energy conversion efficiency=energy inputenergy used for growth​×100

Give your answer to 3 significant figures.

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7.4 Trophic levels in an ecosystem (biology only) Questions

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