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AQA · GCSE · Biology · Higher

Biomass ratio calculation

Q07.3 2 marks

In Question 07.2, another farmer produced 4200 kg of maize seeds in a field, fed the maize to 1000 chickens, and the mean mass of one full-size chicken was 2.2 kg.

Calculate the ratio of chicken biomass to maize seed biomass. Use data from Question 07.2. Give your answer in its simplest form.

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Marking points

  1. 1 Calculates chicken biomass as 2200 kg and forms 2200:4200 in the correct order.
  2. 2 Simplifies the paired ratio correctly, canonically to 11:21.

Why this answer loses marks

Write maize biomass before chicken biomass.

The requested order is chicken to maize; reversing it gives the reciprocal even if the numbers are simplified.