Biology I Workbook is specially written for foundation students taking Biology I at the Centre for Foundation Studies, IIUM. The purpose of this workbook is to provide students with exercises to help them understand the topics in Biology I. This book consists of multiple-choice questions and structure questions for 13 chapters. The answer schemes and feedback are provided at the end of each chapter as a guidance for the students to understand the concepts. The questions in each chapter were tested on students and moderated to confirm their validity.