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