Abstract
This paper attempts to review the effects of language diversities in learning of biology, restricted its boundaries to Nigeria’s ethnic languages, the paper research objectives such as investigating the language blend in a typical Nigerian biology classroom, ascertaining the pupils' preferences for their preferred language of teaching, assessing the disparity between pupils' academic performance when learning in English compared to Indigenous languages. The paper reviewed several previous works from scholars on different concepts revolving around the research study including; Educational Multilingualism, English as the medium of instruction, Use of indigenous languages as the medium of instruction, Issues associated with the use of English as the language of instruction, Issues associated with the use of indigenous languages as the language of instruction.