Life cycle of a mosquito Lesson 5 Unit
- Slides: 13
Life cycle of a mosquito Lesson 5 Unit: Diseases Mrs. Kalicharan
What does this picture show?
Adult mosquitoes � Adult mosquitoes lay their eggs on the surface of stagnant water. � Aedes aegypti which carries yellow fever, dengue and chikungunya prefers clean water.
Eggs - Larvae � Within a few days the eggs hatch into active larvae (wrigglers). These fed on microscopic organisms in the water. � The larvae breathe using air tubes which obtain atmospheric oxygen. � Their gills extract oxygen that is dissolved in the water.
Larvae- Pupae � They feed and grow for about a week or two and then change into pupae. � Pupae hangs from the surface of the water and breathe in air. � Inside the pupal case larval tissue are reorganised to form adult organs. � After a few days a young adult emerges.
Adult female mosquito � The mature female requires a meal of blood for her eggs to mature. � When she bites a human she secretes saliva which prevents blood from clotting. � If she bites an infected person she takes in pathogen in the blood.
Adult mosquito � The pathogen goes through a stage of its life cycle and enters the salivary glands of the mosquito. � When an infected mosquito bites a healthy person, saliva containing pathogens is injected into the person’s blood.
Life cycle of a mosquito
The four stages of a mosquito
Where each stage is found
Life cycle of a mosquito
Actual pictures of mosquito lifecycle
Exercise � Draw and label each stage in the life cycle of a mosquito. � Follow the rules of biological drawings. � Include annotations indicating the habitat of each stage of the mosquito life cycle. � Lab report (practice SBA)- 10 marks.