Standard Science Primary 4 Cycles

Why does spraying oil on the surface of stagnant water prevent mosquitoes from breeding?

A It kills the adult mosquitoes.
B It makes the water too hot for the larvae.
C It prevents the eggs from being laid.
D It stops the larvae and pupae from breathing.
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Worked Solution

Step 1: Mosquito larvae and pupae live in water but breathe air through tubes at the surface. Step 2: Oil creates a layer that blocks these tubes. Step 3: This prevents them from breathing, killing them.

Correct answer: It stops the larvae and pupae from breathing.

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