Biomass gasification is a thermochemical process that converts organic materials like agricultural residues (such as coconut shells, groundnut shells, and rice husk) into a synthesis gas (syngas). This syngas is a mixture primarily composed of hydrogen, carbon monoxide, and methane, along with smaller amounts of other gases like carbon dioxide. The syngas produced can be used for various applications, including direct heat generation for industrial processes and power generation through internal combustion engines or gas turbines. Therefore, statements 1 and 3 are correct.