ABSTRACTThis study investigated the effects of concept mapping on students’ achievement in Biology. The study was guided by three research questions and three hypotheses using pretest and posttest design. The population of the study was made up of ten thousand and forty five students (10,045) in Senior secondary school class two (2), in the (2015/2016) academic session in Aba Educational zone, Abia state. The sample consisted of 400 Biology students, comprising 210 students in the experimen...