Book excerpt: Whenever a student decides to prepare for any examination, her/his first and foremost curiosity is about the type of questions that he/she has to face. We feel great pleasure to present this book “KVPY Stream-SA (14 Years solved papers 2007 to 2020) with 3 Practice Papers” before you. Wherein, we have made an attempt to provide a unit wise collection of questions asked in KVPY with answers and solutions to the majority of questions. Solutions to the questions have been written in such a manner that the students will be able to understand the application of the concepts and can answer some other related questions too. We firmly believe that the book in this form will definitely help a genuine, hardworking student. We have tried our best to keep errors out of this book however, comments and suggestions from the readers will be highly appreciated and incorporated in the subsequent editions. We wish to utilize the opportunity to place on record our special thanks to all members of the Content Development team for their efforts to make this wonderful book. KVPY Stream-SA (14 Years solved papers 2007 to 2020) with 3 Practice Papers incorporates the following units:- Physics : Mechanics Heat & Waves Electrodynamics Optics Modern Physics Chemistry : Physical Chemistry Inorganic Chemistry Organic Chemistry Mathematics : Number System Algebra Geometry Surface Area & Volume Commercial & Clock Trigonometry Biology : Diversity in the Living World, Structural Organization in Plants & Animals Cell : Structure & functions Plant physiology Human physiology Reproduction Genetics & evolution Biology in Human Welfare Biotechnology Ecology