Abstract

The study investigated senior secondary school II students’ morphological awareness and vocabulary development in English in Ibadan North East and Lagelu Local Government Areas of Oyo State. Five research questions were answered in the study. Participants were 200 students from four schools in the area. The survey research design was adopted in the study. Data collected were analysed using frequency counts, percentage, and t-test. Findings showed that students’ awareness of morphological principles is high and Students’ application of morphology in writing is low. There was no significant difference between male and female students’ application of morphology in writing. The study also revealed that there was no significant difference between science and arts students’ application of morphological principles. It was also revealed that there was a significant difference between students’ awareness of morphological principles and their vocabulary development. Based on the findings, discussions, conclusions and recommendations were made on how to improve students’ vocabulary development through morphological awareness in English.