Paper 1 · People, Development and Environment
Which of the following statements about biogas are true? 1. Biogas is a renewable gas. 2. Biogas is produced by the anaerobic breakdown and fermentation of raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste and food waste. 3. The main constituents of biogas are methane, carbon dioxide and hydrogen sulphide.
- Biogas is a renewable gas
- Biogas is produced by anaerobic breakdown and fermentation of organic waste materials
- The main constituents of biogas are methane, carbon dioxide and hydrogen sulphide
A1 and 3
B1 and 2
C2 and 3
D1, 2 and 3 ✓ Correct
Correct answer: (D) 1, 2 and 3 — All three statements are true, so that is the answer.
Explanation
★All three statements are true, so that is the answer.
★Biogas is a renewable gas, so statement one is true.
★It is made by the anaerobic breakdown and fermentation of organic waste, so statement two is true.
★Its main constituents are methane, carbon dioxide and hydrogen sulphide, so statement three is true.
★So each of the three statements is true.
★So the answer is 1, 2 and 3.
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