Choose the incorrect statement
(A) We are encouraged to plant more trees so as to ensure clean environment and also provide bio-mass fuel
(B) Gobar gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen
(C) The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash
(D) Bio-mass is a renewable source of energy
Answer : (C)
(A) Correct. More plants means cleaner and healthier environment. More trees will provide more bio-mass fuel.
(B) Correct. Gobar gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen
(C) Incorrect. The main ingredient of bio-gas is methane and not ethane.
(D) Correct. Bio-mass is a renewable source of energy as it depends on the growth of plants and trees which are renewable.
Therefore option (C) is correct