The host in which the sexual reproductive stage of a parasite occurs is called the

The host in which the sexual reproductive stage of a parasite occurs is called the

• A. Vector
• B. Commensal
• C. Intermediate host
• D. Definitive host

Answer: (D)

Sexual reproduction in parasites happens in the host that can support mating and production of offspring, allowing the parasite to complete its life cycle. That host is the definitive host. In this stage the parasite reaches sexual maturity and mates, producing eggs or embryos that continue the cycle. By contrast, an intermediate host is where earlier developmental stages occur—often asexual replication or development of larvae before they move on to the definitive host. A vector is the means by which the parasite is transmitted to a new host, not defined by where its sexual cycle occurs, and commensal describes a relationship type rather than a role in the parasite’s development. For example, in schistosomiasis, humans are the definitive host for the adult worms to mate and lay eggs, while snails serve as intermediate hosts where larval forms develop; the mosquito acts as a vector for malaria, but its role is primarily transmission, with the sexual cycle occurring in the definitive host.

Sexual reproduction in parasites happens in the host that can support mating and production of offspring, allowing the parasite to complete its life cycle. That host is the definitive host. In this stage the parasite reaches sexual maturity and mates, producing eggs or embryos that continue the cycle. By contrast, an intermediate host is where earlier developmental stages occur—often asexual replication or development of larvae before they move on to the definitive host. A vector is the means by which the parasite is transmitted to a new host, not defined by where its sexual cycle occurs, and commensal describes a relationship type rather than a role in the parasite’s development. For example, in schistosomiasis, humans are the definitive host for the adult worms to mate and lay eggs, while snails serve as intermediate hosts where larval forms develop; the mosquito acts as a vector for malaria, but its role is primarily transmission, with the sexual cycle occurring in the definitive host.