The narrowly utilitarian arguments for conserving biodiversity areobvious; humans derive countless direct economic benefits from nature food (cereals, pulses, fruits), firewood, fibre, construction material,industrial products (tannins, lubricants, dyes, resins, perfumes ) andproducts of medicinal importance. More than 25 per cent of the drugscurrently sold in the market worldwide are derived from plants and 25,000species of plants contribute to the traditional medicines used by nativepeoples around the world. Nobody knows how many more medicinallyuseful plants there are in tropical rain forests waiting to be explored.With increasing resources put into ‘bioprospecting’ (exploring molecular,genetic and species-level diversity for products of economic importance),nations endowed with rich biodiversity can expect to reap enormousbenefits.So the correct option is '(i), (iv) and (vi)'.