1. The document discusses biomass as a renewable source of energy that can be used to generate electricity and produce transportation fuels like ethanol. 2. Key sources of biomass include agricultural waste, wood waste, and energy crops. The most efficient biomass residues for energy production are bagasse, rice husks, and wood. 3. Biomass can be converted into energy through combustion, gasification, and pyrolysis processes. Combustion is used to produce steam for electricity generation, while gasification produces syngas that can be used for heat or power.