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| 1. |
(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) The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash | |