Question
Malarial parasite ‘Plasmodium’ completes its life cycle in two hosts. Draw its complete life cycle and explain various stages it follows throughout its life.
✓
Answer
Stages:
- The stage in which the parasite enters in the body of humans through saliva of mosquito-sporozoite stage.
- Asexual reproduction of sporozoites in liver cells, resulting into bursting of those cells and releasing outside into the blood.
- Sporozoites infect RBCs, cause them to get burst and represented by repeated cycles of fever. Released parasites also infect other RBCs.
- Parasites then follow sexual stage in RBCs which is called as ring signet stage and appears as a ring inside the RBCs under microscope. Usually presence of malarial parasite in humans is identified by pathologists by this stage.
- Female mosquito takes up gametocytes with the blood of host. Fertilisation and development takes place in the intestine of mosquito.
- From intestine, parasite comes to the salivary glands from where it reaches to human body and that is how the cycle continues.
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