(d) : Plasmodium is digenetic i.e., it completes its life cycle in two hosts, asexual cycle in man and sexual cycle in Anopheles mosquito. The breeding places of this mosquito is ponds, marshes, swampy areas etc. So, if all the ponds and puddles are destroyed, Anopheles will not be able to survive leading to destruction of its parasite, Plasmodium.