Primary 3 Science — Cycles Practice | Standard

Standard Science Primary 3 Cycles

Why do insects like cockroaches moult several times during their nymph stage?

A To change their body colour.

B To allow their bodies to grow bigger.

C To protect themselves from predators.

D To help them breathe better.

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Worked Solution

Step 1: Insects have a hard outer covering (exoskeleton) that does not stretch. Step 2: To grow, they must shed the old skin and grow a new, larger one. Step 3: This process is called moulting.

Correct answer: To allow their bodies to grow bigger.

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