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The questions in this quiz are suitable for GCSE biology students studying how the rate of decay affects temperature, water & oxygen availability, the use of compost and manure by gardeners and farmers, andanaerobic decay, methane gas and biogas generators.

If you struggled with the quiz, don't panic - we've got you! You can revise by clicking the links below.

To brush up on your GCSE decomposition knowledge, click on the link to your awarding body specific revision:

Click the links below to try our GCSE biology exam-style or quick-fire quizzes and test your skills and knowledge: