(b) invertase
Diastase hydrolyses starch to maltose; maltase hydrolyses maltose to glucose and zymase decomposes glucose to ethyl alcohol and carbon dioxide.
\(Starch \xrightarrow {diastase} n\,Maltose \xrightarrow {maltase} 2n\)
\(Glucose \xrightarrow {zymase} C_2H_5OH+CO_2\)