Standard Science Primary 4 Cycles

Oil is sometimes sprayed on the surface of stagnant water to kill mosquito larvae. How does this work?

A It poisons the larvae.
B It prevents the larvae from breathing.
C It stops the eggs from hatching.
D It prevents the pupa from turning into adults.
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Worked Solution

Step 1: Mosquito larvae (wrigglers) breathe through tubes at the water surface. Step 2: A layer of oil blocks these tubes. Step 3: The larvae die due to a lack of air.

Correct answer: It prevents the larvae from breathing.

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