Answer: B) Methane Explanation: The main constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia. Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion.

Article 161 mentions the Pardoning Power of the Governor. It states that the Governor of a State shall have the power to grant pardons, reprieves, respites or remissions of punishment or to suspend, remit or commute the sentence of any person convicted of any offence against any law relating to a matter to which the executive power of the State extends. When a convict has committed an offence against state law, the concerned punishment can be granted the pardon, reprieve, respite and remission by the Governor of the state.