Standard Science Primary 3 Cycles

The diagram shows the life cycle of a frog. What is the main difference between the young (tadpole) and the adult frog?

A The tadpole has 4 legs, while the frog has no legs.
B The tadpole breathes through gills, while the frog breathes through lungs and moist skin.
C The tadpole eats insects, while the frog eats water plants.
D The tadpole lives on land, while the frog lives in water.
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Worked Solution

Step 1: Tadpoles are aquatic and use gills to breathe. Step 2: Adult frogs are amphibians and develop lungs, but also use their skin for gas exchange. Step 3: This is a key biological transition.

Correct answer: The tadpole breathes through gills, while the frog breathes through lungs and moist skin.

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