Q. With reference to “Bio-gas” consider the following statements:
1.It is produced by aerobic fermentation of organic matter in the presence of oxygen.
2.Biogas generation is influenced by the weather. 
3.Less energy is required to produce Biogas compared to extracting natural gas.
Which of the statements given above is/are correct?

[A] 1 and 2 only

[B] 2 only

[C] 2 and 3 only

[D] 3 only

Answer: C
Notes:

Explanation –

Statement 1 is incorrect. Biogas is produced by anaerobic fermentation of organic matter in an oxygen-free environment.

Statement 2 and 3 are correct. Biogas generation, like other renewable energy sources (such as solar and wind), is influenced by the weather. Less energy is required to produce Biogas compared to extracting natural gas.

Source: ForumIAS