Explanation:

Endemic plants: A species which is only found in a given region or location and nowhere else in the world. This definition requires that the region that the species is endemic to, be defined, such as a "site endemic" (e.g. just found on Mount Celaque), a "national endemic" (e.g. found only in Honduras), a "geographical range endemic" (e.g. found in the Himalayan region, which however covers several Himalayan countries and therefore is not a national endemic), or a political region endemic (e.g. found i countries of Central America).Exotic plants are introduced from other
places of world and requires a lot of resources for their survival but does not necessarily threaten survival of native plants. These plant and animal species are considered to be among the most severe agents of habitat alteration and degradation, and they are a major cause of the continuing loss of biological diversity throughout the world.Invasive plants are those plants which have
been brought in from other places and they threaten survival of native plants. Naturalised plants are also brought in from other places but are surviving and spreading without man's help. These plants may become invasive species.