The idea of the book entitled “Objective Life Science: MCQs for Life Science Examination” was born because of the lack of any comprehensive book covering all the aspects of various entry level life science competitive examinations in particular conducted by CSIR, DBT, ICAR, ICMR, ASRB, IARI, State and National Eligibility Test, but not limited to. This book, covers all the subjects of life science under 13 section namely, 1. Molecules and their interaction relevant to biology; 2. Cellular organization; 3. Fundamental processes; 4. Cell communication and cell signaling; 5. Developmental biology; 6. System physiology – Plant; 7. System physiology – Animal; 8. Inheritance biology; 9. Diversity of life forms; 10. Ecological principles; 11. Evolution and behavior; 12. Applied biology and 13. Methods in biology. Each Section has been further divided into two parts with 200 short tricky questions and 100 applied conceptual questions. The ultimate purpose of this book is to equip the reader with brainstorming challenges and solution for life science and applied aspect examinations. It contains predigested information on all the academic subject of life science for good understanding, assimilation, self-evaluation, and reproducibility.