zoology chapter - 1 - reproduction in organisms chapter - 2 - human reproduction chapter - 3 - reproductive health chapter - 4 - principles of inheritance and variation chapter - 5 - molecular genetics chapter - 6 - evolution chapter - 7 - human health and diseases chapter - 8 - microbes in human welfare chapter - 9 - applications of biotechnology chapter - 10 - organisms and populations chapter - 11 - biodiversity and conservation chapter - 12 - Environmental issues