Life Cycle of a Frog: Free KS2 Worksheet (Ages 9 to 11)

What the frog life cycle teaches in KS2 science

In Year 5, children compare the life cycles of a mammal, an amphibian, an insect and a bird. The frog is the classic example of an amphibian because its life cycle shows such dramatic change. A frog begins as a tiny egg in a jelly clump called frogspawn, hatches into a water-living tadpole that breathes through gills, develops into a froglet as legs grow and the tail shrinks, and finally becomes an air-breathing adult frog that can live on land and in water. This worksheet asks children to recall the order of these stages and to use the correct vocabulary, which is exactly what the curriculum expects at this stage.

Understanding metamorphosis

The big idea behind the frog life cycle is metamorphosis — the major physical change an animal undergoes as it develops. Unlike a mammal, which is born looking like a small version of its parent, a tadpole looks nothing like an adult frog. Over several weeks it loses its gills and grows lungs, grows back legs and then front legs, and gradually absorbs its tail. Drawing a comparison with a butterfly's life cycle (egg, caterpillar, pupa, adult) helps children see that metamorphosis is a pattern shared by amphibians and many insects, while birds and mammals follow a different route. The describing task on this sheet encourages children to explain these changes in their own words rather than simply memorising labels.

How to use this worksheet at home or in class

Print the sheet onto plain A4 paper. First, ask children to colour the four stages using the colour key — this slows them down and helps them notice details such as the shrinking tail on the froglet. Next, they answer the questions on the lines, using the word bank for the stage names and their own words for the final describing question. For an extension, ask children to add their own arrows around the circle to show the cycle repeating, or to research how long each stage lasts (in the UK, common frog spawn usually hatches after one to three weeks, and a tadpole takes around 12 to 16 weeks to become a froglet, though this varies with species and water temperature).

Common misconceptions to watch for

A few ideas often trip children up. First, many assume a frog lays its eggs on land — in fact most frogs lay frogspawn in ponds and still water, and the early stages are entirely aquatic. Second, children sometimes think the tail simply drops off the froglet; it is actually reabsorbed into the body to provide nutrients as the animal develops. A third mix-up is frogspawn and toadspawn: frogs lay clumps of eggs, while toads lay long strings of eggs wound around pond plants. Reinforcing the correct terms — frogspawn, tadpole, froglet, adult — and the word metamorphosis will set children up well for comparing amphibian, insect, bird and mammal life cycles later in the unit.

Frequently asked questions