International Journal of Academic Pedagogical Research (IJAPR)   Year: 2023 | Volume: 7 | Issue: 1 | Page No.: 77-80 Effect of Problem-Solving Instructional Strategy on Students' Academic Achievement and Attitude towards Biology in Delta North Senatorial District Download PDF OKAFOR, Felicity Uju and Prof. T. E. Agboghoroma Abstract: The study looked at the effect of problem-solving instructional strategy on academic achievement and attitude of biology students in Delta North Senatorial District. The study used a quasi-experimental design. 6,453 SSII Biology students made up the study's population. There were 252 SSII Biology students in the sample. Biology Achievement Test and Biology Attitude Scale were the study's instruments. Reliability coefficients of 0.83 and 0.72, were obtained for BAT and BAS using Kuder-Richardson formula 21 and Cronbach Alpha. The findings revealed that in terms of mean achievement and attitude scores, there was a significant difference between students taught biology using problem-solving instructional strategy and lecture method, favouring problem-solving instructional strategy. The study concludes that problem-solving instructional strategy enhance student achievement and attitude toward biology more effectively than lectures. It was recommended amongst other that biology teachers should use problem-solving strategy while teaching biology to senior secondary school students.