Question

The mature infective stages of malarial parasite which are transferred from mosquito to man are

• A. Trophozoites
• B. Sporozoites
• C. Gametocytes
• D. Merozoites.

Answer 1

The correct option is B Sporozoites

The mature infective stages of malarial parasite which are transferred from mosquito to man are sporozoites. The nucleus of oocyst divides first by meiosis and subsequently by mitosis, forming large number of small haploid nuclei. At the same time, the cytoplasm develops large vacuoles. The tiny nuclei and cytoplasmic masses form elongated and spindle shaped bodies called sporozoites. Each oocyst produces about 1,000 sporozoites.

When mature oocysts rupture, the sporozoites are liberated into the haemocoel of the mosquito. Being motile, the sporozoites move to different organs in the body cavity of the mosquito, but many of them penetrate the salivary glands of the mosquito. When the female Anopheles mosquito bites a healthy person, the sporozoites are injected into his/her blood along with saliva. These sporozoites start the cycle again in human body.