Production of α-amylase (U/ml) obtained by wild and different mutant strains of (A) Bacillus subtilis and (B) Bacillus licheniformis is compared, using medium M1 containing Soya bean meal as agro-waste. Each bar represents SEM (standard error of the mean) for the mean of three replicates. Different alphabets on different columns represent that these are statistically different (p< 0.001).