Standard Science Primary 3 Cycles

Study the life cycle below. At which stage is the animal most difficult to kill using oil on the water surface?

A Stage B
B Stage A
C Stage C
D Stage D
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Worked Solution

Step 1: Stages A, B, and C (Egg, Larva, Pupa) live in water. Step 2: Oil on water blocks air from reaching B and C. Step 3: Stage D is the Adult mosquito, which flies in the air and is not affected by surface oil.

Correct answer: Stage D

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