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AQA GCSE · Question 07.3 · Ecology
Calculate the ratio of chicken biomass to maize seed biomass. Use data from Question 07.2. Give your answer in its simplest form.
Calculate the ratio of chicken biomass to maize seed biomass. Use data from Question 07.2. Give your answer in its simplest form.
How to approach this question
1. Write down the two biomass values from the previous question (chicken and maize).
2. Write them as a ratio in the correct order: chicken : maize.
3. Simplify the ratio by dividing both sides by the highest common factor.
Full Answer
Chicken biomass = 2200 kg
Maize seed biomass = 4200 kg
Ratio = 2200 : 4200
Divide both sides by 100:
22 : 42
Divide both sides by 2:
11 : 21
The question asks for the ratio of chicken biomass to maize seed biomass.
From the previous question (07.2), we have:
- Total chicken biomass = 2200 kg
- Total maize seed biomass = 4200 kg
The ratio is written as:
Chicken biomass : Maize seed biomass
2200 : 4200
To simplify the ratio, we find a common number to divide both sides by.
First, divide both by 100:
22 : 42
Now, we can see both numbers are even, so we can divide by 2:
11 : 21
11 is a prime number, and 21 is not a multiple of 11. Therefore, the ratio is in its simplest form.
The final ratio is **11 : 21**.
Common mistakes
✗ Getting the ratio in the wrong order (maize : chicken).
✗ Not simplifying the ratio to its simplest form.
✗ Making an arithmetic error during simplification.
Practice the full AQA GCSE Biology Higher Tier Paper 2
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