Question

"a mosquito in which the agent of diseases undergoes a a portion of its life cycle is known as a __________________."

Answer 1

A mosquito in which the agent of diseases undergoes a a portion of its life cycle is known as a biological vector.

Step-by-step explanation:

A malarial parasite undergoes half of its life cycle in a female Anopheles mosquito and the remaining half of the pathogenic phase in a human being. The parasite multiplies in the body of the female Anopheles mosquito and as that mosquito bites a healthy individual he becomes infected. Thus the mosquito serves as a vector that transmits the pathogen form a unhealthy individual to a healthy individual.

Answer 2

Mosquitos are usually just carriers of disease agents and not the definitive hosts. When a disease agent spends only a portion of the life cycle in an organism, that organism, in our case, the mosquito is called a disease vector.