An anaerobic biogas generator produces 800 litres800\text{ litres}800 litres of gas each day. Methane makes up 60% of this volume.
A burner uses methane at a rate of 150 litres per hour150\text{ litres per hour}150 litres per hour and operates for 2 hours each day.
The methane store is initially empty. Assume production remains constant and no methane leaks. There are 1000 litres1000\text{ litres}1000 litres in 1 m3 .
What volume of methane remains after 5 complete days?
2.40 m32.40\text{ m}^32.40 m3
1.50 m31.50\text{ m}^31.50 m3
0.90 m30.90\text{ m}^30.90 m3
1.90 m31.90\text{ m}^31.90 m3
40 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.