Dear Student, This notes is prepared on the basis of New Syllabus set by Tamilnadu Govt. and according to Govt. Public Exam question paper.  After the introduction of Samcheer Kalvi in 2015, questions in Science subject have changed considerably and this notes has been prepared in accordance to these changes.  Questions & Answers have been presented mark wise and additional questions are given section wise from Public Exam point of view.  Blue print is given with mark wise and chapter wise break up.  April 2015 Government exam question paper has been given for your practice.  The answers are explained in such a manner that the students will understand at the first time.  This guide is prepared under the guidance and direction of Expert teachers.  We hope you learn well from this book and score 100 100 from the exam. We wish you all the very best. - Editorial Team