The aim of this research was to find out the importance of improvisation in teaching Biology in senior secondary school students in Sokoto metropolis. Total numbers of 31 teachers were used in this study; the instrument used for data collection was questionnaires which were administered personally by the researchers to ten randomly selected secondary schools in Sokoto metropolis. The method used for data analysis was simple percentages to examine the findings. Among the major findings for this is that, there is an adequate instructional materials for teaching Biology in secondary schools in Sokoto State. Also there is a great difference between the performance of the students taught with improvised materials and without any instructional aid. With these findings, we recommend the teachers to be resourceful so as to improvise when the original materials are not available.