Many cultivated plant species reproduce by self-pollination. Self-pollination species
are believed to have originated from cross-pollinated ancestors. These species, as a rule,
must have hermaphrodite flowers. But in most of these species, self-pollination is not
complete and cross-pollination may occur up to 5%. The degree of cross-pollination in selfpollinated species is affected by several factors, e.g., variety environmenta l conditions like temperature and humidity, and location.