Which of the following statements about biogas are true?

1.Biogas is a renewable gas

2.Biogas is produced by anaerobic breakdown and fermentation of organic waste materials

3.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

Explanation

All three descriptions of biogas are accurate, so every statement is true.

Statement 1 is correct, since biogas is renewable because it comes from continually replenished organic matter.

Statement 2 is correct, since it forms by anaerobic breakdown and fermentation of organic waste.

Statement 3 is correct, since its main constituents are methane, carbon dioxide and hydrogen sulphide.

Methane is the combustible component that gives biogas its fuel value.

Household biogas plants commonly use cattle dung as their feedstock.

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