The Gondwana University under the guideline of University Grants Commission (UGC) has decided to revise new scheme of the syllabus for B.Sc. courses to cope up with the changes taking place in global educational scenario of twenty first century. This new guideline of UGC will act as lay out for the students and teachers to enhance the creative potential without compromising the quality of education. The scheme of syllabus is popularly known as Choice Based Credit System (CBCS). In this view, we strongly believe that a comprehensive book covering all topics of model curriculum in zoology require immediately. This book is fruitful outcome of our aforesaid strong feelings.

We feel immense pleasure to present this Text book of Zoology for B.Sc. (Semester- III) Students and Teachers. 

This book includes:
Paper – I    : Animal Diversity (Chordates) and Comparative Anatomy (Core Paper V)
Paper – II    : Physiology and Biochemistry - I (Core Paper VI)
Part – III    : Practical Based on Paper I & Paper II

This is our result of long extensive teaching experience for post graduate and under graduate level. We would like to thanks all my previous students and some faculty friends who provided me excellent feedback that has insisted me in writing this book. In this edition we have adjusted focus on each point of new CBCS syllabus to satisfy needs of student. Additionally, we have maintained both the high quality and quantity of exercises and applications for which the series is known. 
    
The authors also express their gratitude’s towards Mr. Nanjesh Bennur, Director of IIP publication and his team with Mr. Tejesh C Y Coordinator, IPH Section and all for publishing this book in a shortest possible time. The students and faculty will feel ease with our book because it integrate their precise suggestions and anticipate their needs. 
    
We express our deep sense of gratitude to Shri. Swapnil V. Dontulwar, Secretary, Shri. Samarth Shikshan Sanstha, Aheris,  Dr. C. A. Nikhade, Principal, Chintamani College of Arts & Science, Gondpipri, Dist: Chandrapur, Dr. Amir A. Dhamani, Principal, Gramgeeta Mahavidhyalaya, Chimur, Dist: Chandrapur, faculty friends, and our family for their sound support and encouragement. We believe that the book contains all that it needed. But still we also accept that no work is ideal and has scope for improvement and development, therefore we would like to welcome all suggestions from teaching faculty and students for further progress.