Question

The sexual cycle of plasmodium is completed in
A. The gut of the mosquito
B. RBC
C. Liver tissue
D. The salivary gland of the mosquito

Answer 1

Hint: Plasmodium parasites enter the body through the saliva of female mosquitoes from the genus Anopheles. These mosquitoes primarily inhabit the tropical and subtropical parts of the world. Plasmodium’s life cycle is divided into three stages; they are infection of a human with sporozoites, asexual reproduction, and sexual reproduction.

Complete answer:
-The female anopheles mosquito is the primary host for Plasmodium species since the parasite completes its sexual cycle in the gut of the mosquito. The gametocytes formed in the human blood reach the mosquito gut when the mosquito feeds on human blood. These gametocytes further develop into gametes and undergo fertilization then complete their sexual cycle in the mosquito gut.
-Merozoites then enter the red blood cells. This is the beginning of the third phase. The merozoites evolve into a trophozoite. The trophozoite is then converted into an erythrocytic schizont. Each mature schizont gives birth to a new generation of merozoites. When RBC is ruptured, these are released in the bloodstream and invade other RBCs.
-The sporozoites enter the liver and start dividing to form schizont. Each schizont releases many merozoites into the bloodstream. When a female Anopheles mosquito bites an infected person, gametocytes enter the blood of the mosquito. In the mosquito, these gametocytes become microgametes (male gamete) and macrogametes (female gamete). In the stomach of the mosquito, male and female gamete fertilized to form a zygote. This zygote becomes ookinete and later oocyte. When the oocyst ruptures, the sporozoites enter the salivary gland of the mosquito.
Therefore, the correct answer is option A.

Note: In the plasmodium (Plasmodium malariae) life cycle each stage takes a different timeline to complete. the pro-erythrocytic phase in fourteen days, erythrocytic cycle in seventy-two hours, and incubation period in eighteen to forty. In the plasmodium (Plasmodium vivax) life cycle, the pro-erythrocytic phase is around eight days, the erythrocytic cycle in forty-eight hours, and the incubation period is around two weeks.