International Journal of Academic and Applied Research (IJAAR)   Year: 2022 | Volume: 6 | Issue: 12 | Page No.: 98-101 Effects of Concept Mapping (CM) And Teacher's Sex (TS) On Students' Achievement in Biology in Delta State (DS) Download PDF UKREN, Rita and Prof. O. P. Ajaja Abstract: The study looked at how CM and TS affected students' performance in Biology in DS adopting quasi-experimental design. 12,163 SSII Biology students were included in the study. The sample size consisted of 30 students. Data were gathered using the Biology Achievement Test (BAT), which has a 0.83 reliability coefficient obtained using Kuder-Richardson formula 21. Data were analysed with Mean, standard deviation and t-test. The findings showed statistically considerable differences between the Biology achievement of students taught with CM and LM, favouring CM; and that there was no statistically considerable primary influence of TS on students' Biology achievement. The study comes to the conclusion that CM enhances students' Biology achievement more than the lecture technique (LM). Therefore, it was advised that CM be used during Biology instruction.