The diagram shows the flow of biomass through an agricultural food chain. Cattle food crop 22,000 kg Cattle 2,000 kg Humans 200 kg (a) (i) Calculate the percentage efficiency of transfer of biomass between the cattle food crop and humans. Answer = .................................................. % (ii) Write down two ways that biomass is lost from the food chain. 1. ........................................................................... 2. ...........................................................................

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The diagram shows the flow of biomass through an agricultural food chain - OCR Gateway - GCSE Biology - Question 23 - 2018 - Paper 4

Question 23

The diagram shows the flow of biomass through an agricultural food chain. Cattle food crop 22,000 kg Cattle 2,000 kg Humans 200 kg (a) (i) Calculate the percenta... show full transcript

Worked Solution & Example Answer:The diagram shows the flow of biomass through an agricultural food chain - OCR Gateway - GCSE Biology - Question 23 - 2018 - Paper 4

Step 1

Calculate the percentage efficiency of transfer of biomass between the cattle food crop and humans.

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Answer

To calculate the percentage efficiency of biomass transfer, we can use the formula:

ext{Efficiency} = rac{ ext{Biomass at the higher trophic level}}{ ext{Biomass at the lower trophic level}} imes 100

Here, the biomass of cattle is 2,000 kg (higher trophic level) and the biomass of cattle food crop is 22,000 kg (lower trophic level). Thus:

ext{Efficiency} = rac{2000}{22000} imes 100 = 9.09 ext{ %}

Therefore, the percentage efficiency of transfer of biomass is approximately 9.09%.

Step 2

Write down two ways that biomass is lost from the food chain.

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Answer

Egestion (not all biomass consumed is absorbed and some is excreted as undigested food).
Respiration (energy is lost as heat during metabolic processes).

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The diagram shows the flow of biomass through an agricultural food chain - OCR Gateway - GCSE Biology - Question 23 - 2018 - Paper 4

Worked Solution & Example Answer:The diagram shows the flow of biomass through an agricultural food chain - OCR Gateway - GCSE Biology - Question 23 - 2018 - Paper 4

Calculate the percentage efficiency of transfer of biomass between the cattle food crop and humans.

Write down two ways that biomass is lost from the food chain.

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