Infective stages of malarial parasite is formed in

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stomach wall of mosquito

salivary glands of mosquito

haemolymph of mosquito

intestine of mosquito

answer is A.

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Detailed Solution

The parasite which causes malaria, Plasmodium requires two different hosts a vertebrate intermediate host, such as a human, and an insect definitive host, also known as the vector i.e. female Anopheles mosquito.
When the mosquito bites humans it ingests blood cells containing gametocytes. The mosquito digests the blood cells, releasing the male and female gametes, which fuse together and burrow into the mosquito’s gut wall, where they mature inside oocysts.
After 8-15 days (depending on the species) the oocysts burst and sporozoites are released into the body cavity of the mosquito. From there, they travel to the salivary glands. when the mosquito bites these infective sporozoite enters the blood of the humans.
Hence sporozoites are the infective stages of the malarial parasite found in salivary glands of the mosquito.

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