A book is sanctified to preparation to the practical turn of the regional and final stage of the All-russian olympiad of schoolchildren on biology. Each of twelve divisions is sanctified to preparation to the corresponding "cabinet" of practical turn, that is considered more difficult theoretical and contains quite a bit elements that are absent in the school program. Necessary theoretical and practical information is given for implementation tasks of olympiads, the examples of tasks understand, and also the basic difficulties and errors, related to their implementation, are examined. Charts over and illustrations, assisting more effective mastering of material, are brought. All authors of collection in any case are related to preparation to the All-russian olympiad on biology. We hope that this book will become a reliable helper to the teacher for preparation of schoolchildren that is led away by biology and want to win in olympiads.