The malarial parasite 'Plasmodium' is carried only by female Anopheles mosquito and not by the male mosquito because:
The female requires blood to produce eggs
Only certain species of mosquitoes of the Anopheles genus and only females of those species can transmit malaria. Malaria is caused by a one-celled parasite called Plasmodium. Female Anopheles mosquitoes pick up the parasite Plasmodium from infected people when they bite to obtain blood needed to nurture their eggs.