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Human Health and Disease — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease3 Marks
Question
Name the stage ofthe Plasmodium thall is trrnsmitted to human body by the vector. Describe the life cycle of the plrasite in humans.
OR
Trace the life cycle of Plasmodium in humans from the stage of entry, until it is picked up by the female Anopheles.
✓

Answer

Life cycle of Plasmodium in human body:
  • When an infected female Anopheles mosquito bites a person, the sporozoites are injected into the body.
  • They reach the liver cells through blood.
  • The parasite reproduces asexually in the liver cells and by the bursting of liver cells, new cells are released into the blood.
  • They enter the red blood cells (RBCs) and reproduce asexually, by bursting the red blood cells, the cells of the parasite release haemozoin, which causes the cycles of fever, chill and shivering.
  • The released parasite cells infect new red blood cells; some continue the asexual reproduction and cause the cycles of fever.
  • Others enter the sexual stage and form gametocytes in the RBCs, which are picked by the Anopheles mosquito, along with the blood meal.

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