Menike, H. and Chandrasena, W. 2019. INVESTIGATION OF THE EFFECTIVENESS OF USING SELF-DETERMINATION THEORY IN TEACHING BIOLOGY FOR GRADE TEN STUDENTS. International Journal of Research -GRANTHAALAYAH. 7, 4 (Apr. 2019), 46–50. DOI:https://doi.org/10.29121/granthaalayah.v7.i4.2019.872.