Science and technology.
standard 10 science-tecnology of Chapter - 15 slideshow. The chapter's name is Reproduction in Organism. It is fact that all living Organism grow old with time and ultimately die. Every living Organism remains alive on this earth for limited period of time and then dies.
So new Organisms have to Produce in place of those who die. This can be acheived by the process of reproduction in which new Organism are produced from the existing Organisms in order to maintain the life of their species on this earth. The slideshow will be available in the other chapter on edusafar.