why only a female anopheles mosquito is a carrier of malaria causing pythogens and not a male anopheles mosquito
Yes, only the female Anopheles acts as a vector in malaria because only females bite, and male Anopheles live on the sugar found in plant nectar, not on blood. But there is a reason why females suck blood. Proteins in the blood are necessary to produce fertile eggs. Since males do not produce eggs so they have no need for blood. Females require a new blood 'meal' for the production of eggs.