EVERYDAY SCIENCE - LIFE CYCLES
Question 1

Ace read from the news that his house is within a cluster area of numerous Dengue fever cases. Dengue fever is spread through Aedes mosquitoes.

Ace had previously seen a mosquito laying eggs in his garden pond. After some time, he observed some adult mosquitoes flying away from the pond.

mosquito ace.jpg
Answer 1

Fill in the blanks with the keywords provided below.
[eat] • [block] • [larger] • [moult] • [breathing tube] • [larvae] • [pupae] • [hatch]

a) Fill in the blanks to show what happens to the mosquito eggs that are laid in the pond.

Answer:

The eggs into , which are also known as wrigglers.
The wrigglers several times in order to grow .
After some time, the wrigglers transform into . During this stage of their life cycle, they do not .



b) What is one method to kill the wrigglers in the pond?

Answer:

Pour some oil into the pond. The oil will spread out and form a thin layer on the surface of the pond. The layer of oil will the of the wrigglers. They cannot take in atmospheric oxygen from above the water.





DO YOU KNOW.png

“The National Environment Agency has placed 50,000 black cylindrical traps at housing estates around Singapore. They are called Gravitrap, designed to attract and trap female Aedes adult mosquitos that are looking for a site to lay eggs in. Have you seen them before?”