Question

Sporogony in malarial parasite occurs in
A. Human liver
B. Human red blood cells
C. Stomach of female Anopheles
D. Stomach wall of female Anopheles

Answer 1

Hint: Sporogony is a phase of sexual reproduction where sporozoites are formed from the zygotes. In malaria, it penetrated in the midgut wall of the mosquito.

Complete answer:
Sporogony is the development of spores usually containing sporozoites that are characteristic of certain sporozoans and arise from the encystment and eventual division of the zygote.
The life cycle of the malaria parasite requires two hosts. A malaria-infected female Anopheles mosquito inserts sporozoites in the human host after a blood meal. Sporozoites attack liver cells and grow into schizonts, which split up and release merozoites. After this initial reproduction of the liver, the parasites undergo asexual proliferation in the erythrocytes. Merozoites are infecting red blood cells. Ring stage trophozoites grow into schizonts, a rupture that releases merozoites. Some parasites are characterised by sexual erythrocytic stages. Blood stage parasites are responsible for the clinical symptoms of this condition. Gametocytes, male and female, are eaten by the mosquito of Anopheles after a blood meal. The replication of the parasites in the mosquito is termed as the sporogonic cycle. When in the stomach of the mosquito, the microgametes enter the macrogametes-generating zygotes. The zygotes, in fact, become elongated and motile, which penetrate the mid stomach wall of the mosquito, where they become oocysts. Oocysts emerge, split, and release sporozoites that make their way to the salivary glands of the mosquito. The inoculation of sporozoites into a new human host perpetuates the life cycle of malaria.

Thus, the correct answer is option D. i.e., Stomach wall of female Anopheles.

Note:Plasmodium is a digenetic parasite that means it ends its life cycle in two hosts. Its main host is the female Anopheles mosquito, which completes its reproductive life cycle. The intermediate host is the human being, which ends the asexual life cycle.