humans regard certain insects as pests,and attempt to control them using insecticides and host of other techniques. some insects damage crops by feeding on sap,leaves or fruits,a few bite humans and livestock ,alive and dead,to feed on blood,and some are capable of transmitting diseases to humans,pets and live stock. nevertheless, without insects to pollinate flowering plants,a necessary process in their reproduction, the terrestrial portion of the biosphere(including humans) would be devastated,as a great many organisms rely on flowering plants. many other insects are considered ecologically beneficial as predators and a few provide direct economic benefit. silkworms and bees have been used extensively by human for the production of silk and honey,respectively