The salient features of Mentor in Science are: A detailed summary of important concepts covered in the textbook has been given at the beginning of each chapter. Complete solution to NCERT Intext questions, Textbook Exercises as well as Exercises from the Book EXEMPLAR have been included. Important additional questions and numerical problems of varying difficulty level have been incorporated in each chapter. The questions have been arranged systematically in MCQs, Assertion-Reason type, very short answer type, short answer type and long answer type questions. Case based questions have also been included in each chapter. The length of the answers has been especially kept in mind to enable students to write accordingly in the examinations. The language has been kept simple and lucid for the clear understanding. Neatly labelled diagrams have been included wherever required.