Life Cycle
Animal Life: Life Cycle
Life Cycle
Life Cycle Basics
What you'll learn
- Describe the life cycle stages of a butterfly and a frog.
- Compare egg-laying animals with animals that give live birth.
- Understand the word metamorphosis.
- Recognise how young animals are cared for.
Key concepts
Level 1 - Getting started
A life cycle is the series of stages a living thing passes through from birth to adulthood.
Level 2 - Building the idea
Most birds hatch from eggs. Mammals like dogs, cats, and cows give birth to live young and feed them milk.
Level 3 - Going deeper
A butterfly's life cycle: egg to caterpillar (larva) to pupa to adult. A frog's life cycle: egg to tadpole (which breathes with gills) to adult frog. This change of form is called metamorphosis.
Level 4 - Indian context
Farmers keep silkworms for silk, collected from cocoons made in the pupa stage. Turtle eggs hatch in sand on their own, unlike hen eggs that need to be kept warm. An elephant takes about 22 months before its baby is born — the longest of any land mammal.
Worked example
Order the butterfly life cycle
Step 1 - List stages jumbled: pupa, adult, egg, caterpillar.
Step 2 - Recall egg comes first.
Step 3 - Recall caterpillar eats and grows, then forms a pupa.
Step 4 - Write the correct order.
Answer: Egg, caterpillar, pupa, adult butterfly.
Compare frog and hen
Step 1 - Recall frog lays eggs in water; tadpole has gills.
Step 2 - Recall hen lays eggs on land; needs to sit and keep them warm.
Step 3 - Compare young stage: tadpole vs chick.
Step 4 - State one similarity and one difference.
Answer: Similarity: both hatch from eggs. Difference: tadpole lives in water and breathes with gills; chick breathes air like a hen.
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| Tadpole is called a fish | It swims and breathes with gills | Tadpole is the young stage of a frog, not a fish |
| All animals hatch from eggs | Bird and reptile life cycles overgeneralised | Many mammals give birth to live young instead |
| Metamorphosis means growing bigger only | Growth confused with change of form | Metamorphosis means changing body form completely, like caterpillar to butterfly |
| Young animals always look like their parents | Based on mammals only | Caterpillars and tadpoles look very different from their adult form |
Quick check
- What are the four stages of a butterfly's life cycle?
- What is a young frog called?
- Name one animal that gives birth to live young.
- What word describes the change from caterpillar to butterfly?
- Stretch: Draw the life cycle of a frog as a circular diagram with four labelled stages.
Revision tip: Life cycle order to remember: egg leads to a young stage, which changes (sometimes by metamorphosis) into an adult.
Open the Practice tab for graded questions on Life Cycle Basics.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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