Figure 8 shows a compost bin - Edexcel - GCSE Biology - Question 5 - 2022 - Paper 1
Question 5
Figure 8 shows a compost bin.
(i) Give one reason why the compost bin has gaps at the sides.
(ii) A student placed 2.0 kg of vegetable waste in a compost bin.
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Worked Solution & Example Answer:Figure 8 shows a compost bin - Edexcel - GCSE Biology - Question 5 - 2022 - Paper 1
Step 1
Give one reason why the compost bin has gaps at the sides.
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Answer
The gaps in the compost bin allow air (or oxygen) to enter and also enable excess water to drain out.
Step 2
Calculate the rate of decomposition of the vegetable waste.
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Answer
To find the rate of decomposition, first calculate the change in mass:
Change in mass = Initial mass - Final mass = 2.0 kg - 1.7 kg = 0.3 kg.
Next, use the formula for rate of decomposition:
extRateofdecomposition=Time takenChange in mass=20 days0.3 kg=0.015 kg per day.
