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 perce... 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 from the cattle food crop to humans, we can use the formula:

$\text{Efficiency} = \left( \frac{\text{Biomass at the next trophic level}}{\text{Biomass at the previous trophic level}} \right) \times 100$

Substituting the values:

$\text{Efficiency} = \left( \frac{200 \text{ kg}}{2000 \text{ kg}} \right) \times 100 = 10\%$

Therefore, the efficiency of transfer is 10%.

Step 2

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

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Answer

Egestion: This refers to the undigested food that is expelled by the organisms.
Respiration: This process releases energy and leads to the loss of biomass in the form of heat.

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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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