Biology · Grades 7–11
Food-web transfer model
Convert the supplied transfer efficiency to a fraction. Do not assume that all food webs have a fixed 10% efficiency.
Rule and assumptions
Convert the supplied transfer efficiency to a fraction. Do not assume that all food webs have a fixed 10% efficiency.
transferred energy = available energy × stated efficiency/100
Worked examples
A supplied food-web model transfers 10% of 524 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
transferred energy = available energy × stated efficiency/100 524 × 10/100 = 52.4
52.4 kJ
A supplied food-web model transfers 19% of 1375 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
transferred energy = available energy × stated efficiency/100 1375 × 19/100 = 261.25
261.25 kJ
Try two questions
A supplied food-web model transfers 17% of 446 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
A supplied food-web model transfers 19% of 898 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
Answers and reasoning
Answers and marking notes
- 75.82 kJ
transferred energy = available energy × stated efficiency/100 446 × 17/100 = 75.82
- 170.62 kJ
transferred energy = available energy × stated efficiency/100 898 × 19/100 = 170.62
Further reading and review references
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Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.