Explicit BIOLOGY

O.J. OLAOYE

273 pages

The fourth edition of Explicit Biology: A Revision Course represents a thorough revision of the book rather than a simple reprint. Its central purpose remains unchanged: to make Biology easier to understand, easier to revise and easier to apply successfully in examinations. What has changed is the degree to which every chapter has now been aligned with the current JAMB Biology syllabus and its stated learning objectives. In preparing this edition, each chapter was reviewed from three perspectives: syllabus coverage, scientific accuracy and examination usefulness. Explanatory notes have been rewritten where necessary for greater clarity and precision. Topics that were unnecessarily detailed have been streamlined, while areas that now receive greater emphasis in the syllabus have been strengthened. A new chapter on Biotechnology has also been introduced to reflect its explicit place in the current syllabus, including applications in agriculture, medicine, pharmaceuticals and the food industry, as well as recombinant DNA technology, genetically modified organisms, gene therapy and biosafety. The structure of the book has also been improved to make revision more purposeful. Every chapter opens with a JAMB Syllabus Focus that tells the student what should be understood or demonstrated after studying the chapter. Throughout the text, emphasis is placed not merely on memorising facts but on understanding relationships: structure and function, organism and environment, inheritance and variation, adaptation and survival, and evidence and biological explanation. Tables, comparisons, worked examples and focused examination notes are used where they improve understanding and save revision time. The revision-question bank has received particular attention. Past examination questions remain valuable because they reveal how biological ideas have historically been tested. However, Biology is a dynamic science, and some older questions contain outdated terminology, defective options or assumptions that are no longer scientifically defensible. Such questions are no longer left within the active chapter banks simply because they once appeared in an examination. Questions that remain valid have been retained; those that are fundamentally obsolete or irreparably ambiguous have been transferred to a Deprecated Legacy Questions appendix, where their historical value is preserved alongside guidance explaining why they should no longer be treated as current examination material. Additional model questions have been included where necessary to cover important syllabus objectives that were under-represented in the older question bank. Detailed answers and explanations are provided at the back of the book so that students can understand not only which option is correct, but also why it is correct and why alternative options may be unsuitable. Students are strongly encouraged to attempt each question independently before consulting the explanations. This edition is therefore intended to function both as a teaching companion and as a focused revision tool. Used systematically, it should help students identify weaknesses, correct misconceptions, improve their ability to interpret unfamiliar questions and approach JAMB Biology with greater confidence. Teachers and tutors should also find the syllabus-focus statements useful for lesson planning, revision classes and assessment. I remain grateful to the students, teachers and readers whose use of earlier editions has helped to sustain and improve this work. No textbook is ever beyond refinement, and constructive observations will always be valuable. It is my hope that this fourth edition will help students study Biology with greater understanding, accuracy and confidence, and ultimately achieve the examination success for which they have worked.