Statistical analysisRESULTSBrine shrimp lethality The LC50 value for the percentage of mortality brine shrimp treated with Mentha spicata extracts as indicated by the regression equation (R2= 0.8520) was found to be 1701 μg/ml. The value was significantly (p<0.05) higher when compared to the standard potassium dichromate (LC50 = 164.03 μg/ml. In addition there was also a significant correlation (p<0.05) between the concentration of the extracts, used and the percentage of mortality value, it was found to be increased with increase in the concentration for all the plants tested and the standard as proven by Tukey's test.
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