Motile zygote of Plasmodium occurs in__________.a)Human RBCsb)Human liverc)Salivary glands of Anophelesd)Gut of female AnophelesCorrect answer is 'D'. Can you explain this answer?

Question

Answer

Gut of female Anopheles

When female Anopheles, sucks the blood of an infected person, the gametocytes of plasmodium are picked up by the mosquito. Now sexual reproduction of Plasmodium occurs inside mosquito. The outer envelope of gametocyte is dissolved and its contents are liberated into the cavity of gut. These content undergo gametogony, i.e., formation of microgametes and macroagamete. The nuclei of both fuse and a synkaryon or zygote is formed. This zygote is motionless and spherical for sometime and vermiform very soon. Now, it is called vermicule or ookinete. Ookinete pierces the stomach wall and forms a cyst(oocyst) on its outer surface which has about 1000 sporozoites. The latter pass into salivary glands of the mosquito.

Answer

Plasmodium completes their life cycle in two hosts, female anopheles and human beings. The motile zygote of plasmodium occurs in gut of female anopheles, which get transferred to human being during mosquito bite.

Answer

Understanding the Motile Zygote of Plasmodium
The lifecycle of Plasmodium, the malaria-causing parasite, involves multiple stages and hosts. One of the key stages is the formation of the motile zygote.
Where Does the Motile Zygote Form?
- The motile zygote, also known as the ookinete, develops in the gut of the female Anopheles mosquito after the mosquito has taken a blood meal containing the gametocytes of Plasmodium.
Life Cycle of Plasmodium
- Gametocyte Ingestion: When a female Anopheles mosquito bites an infected human, it ingests gametocytes (male and female) present in the human's bloodstream.
- Fertilization: Inside the mosquito’s gut, the male and female gametocytes fuse to form a zygote.
- Development into Ookinete: This zygote then develops into a motile form called the ookinete, which can move through the gut wall of the mosquito.
Significance of the Gut Environment
- Nutrient-Rich Environment: The gut provides a favorable environment with nutrients and conditions that are conducive for the development of the zygote into the motile ookinete.
- Movement and Penetration: The motility of the ookinete allows it to penetrate the gut wall, where it eventually forms oocysts, leading to the next stages of Plasmodium development.
Conclusion
To summarize, the correct answer to the question regarding the motile zygote of Plasmodium is option 'D', as it specifically occurs in the gut of the female Anopheles mosquito, marking a crucial phase in the parasite's lifecycle that facilitates its transmission to humans.

Answer

D

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