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Life Cycles: From Egg to Adult

Third graders learn that living things have life cycles — stages of birth, growth, reproduction, and death — and follow the amazing transformation of a caterpillar into a butterfly through metamorphosis.

Grade 3Life Cycles40 minutes1 class period5E ModelExplicit teaching4 StandardsNGSS
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Explain a life cycle.
  • ✓Order the butterfly stages.
  • ✓Explain metamorphosis.
  • ✓Compare different life cycles.
Essential Question

A caterpillar and a butterfly look nothing alike — yet they’re the same animal! Every living thing goes through a life cycle. What are the stages, and how does a caterpillar become a butterfly?

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Put in Order · Interactive

Order the Life Cycle

Project this and have students put the butterfly’s life cycle in order — from egg to caterpillar to chrysalis to butterfly!

🦋 Put the butterfly life cycle in order!Try it
Tap the first stage!
The Lesson · 5E Instructional Model (Engage · Explore · Explain · Elaborate · Evaluate)

40 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Engage — Same Animal?

5 min

A caterpillar and a butterfly look so different — yet they’re the same animal! How?

👩‍🏫 Teacher Moves

  • Show a caterpillar and butterfly.
  • Ask how they’re connected.
  • Pose the question.

🎒 Student Actions

  • Compare them.
  • Wonder how.
  • Predict the idea.
2

Explore — Order the Cycle

10 min

Students investigate.

👩‍🏫 Teacher Moves

  • Send students to Order the Life Cycle.
  • Order the stages.
  • Note the changes.

🎒 Student Actions

  • Order them.
  • Note changes.
  • Explain them.
3

Explain — Stages of Life

11 min

Students explain.

👩‍🏫 Teacher Moves

  • Explain a life cycle.
  • Explain the butterfly stages.
  • Explain metamorphosis.

🎒 Student Actions

  • Explain the cycle.
  • Explain stages.
  • Explain metamorphosis.
4

Elaborate — Other Cycles

9 min

Students elaborate.

👩‍🏫 Teacher Moves

  • Compare a frog’s life cycle.
  • Compare a plant’s life cycle.
  • Explain birth to death.

🎒 Student Actions

  • Compare frogs.
  • Compare plants.
  • Explain the cycle.
5

Evaluate — Evaluate

5 min

Students conclude.

👩‍🏫 Teacher Moves

  • Order a life cycle.
  • Explain metamorphosis.
  • Hand out the exit ticket.

🎒 Student Actions

  • Order it.
  • Explain it.
  • Complete the exit ticket.
Standards Alignment

Built to the standards you report on

Aligned to the Next Generation Science Standards (Grade 3 / Elementary Science).

NGSS
3-LS1-1

Develop a model to describe that organisms have unique and diverse life cycles — birth, growth, reproduction, and death.

NGSS
3-LS3-1

Explain how traits are inherited.

NGSS
3-LS2-1

Explain how animals form groups.

NGSS
SEP-2

Developing and using models.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Life-cycle picture cards.
  • Sentence frame: “First ___, then ___.”
  • Order picture stages.

Support & Access

IEP / 504
  • Start with egg vs. adult.
  • Use clear picture stages.
  • Order two at a time.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Compare complete vs. incomplete metamorphosis.
  • Diagram a plant’s cycle.
  • Raise butterflies.
Materials

What to gather

  • 📽️Projector / board
  • 🦋Life-cycle models
  • 💻Order the Life Cycle
  • 🖼️Stage picture cards
  • ✏️Pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

life cyclethe stages of a living thing’s lifemetamorphosisa big change in body formeggthe first stage of many animalslarvathe caterpillar/wiggler stagepupathe resting, changing stageadultthe grown, reproducing stagereproduceto make offspringstagea step in a life cycle
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
What are the four stages of a butterfly’s life cycle in order?
Egg → caterpillar (larva) → chrysalis (pupa) → butterfly (adult).
QUESTION 2
What is metamorphosis?
A dramatic change in body form during an animal’s life cycle.
QUESTION 3
What are the main events in any life cycle?
Birth (or hatching), growth, reproduction, and death.

Elaborate: compare cycles.

Have students compare the butterfly’s life cycle with a frog’s (egg → tadpole → froglet → frog) and find what’s alike and different. A printable life-cycles sheet is in the Science library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 Life CyclesFlip
Card 1
Term
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Meaning
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Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 Life CyclesQuiz
Score: 0
1 / 6
Question 1
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Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ Life CyclesPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: adult, egg, larva, life cycle, metamorphosis, pupa, reproduce, stage
  1. the grown, reproducing stage
  2. a step in a life cycle
  3. the first stage of many animals
  4. a big change in body form
  5. the stages of a living thing’s life
  6. the resting, changing stage
  7. the caterpillar/wiggler stage
  8. to make offspring

Part B · Show what you learned

  1. What are the four stages of a butterfly’s life cycle in order?
  2. What is metamorphosis?
  3. What are the main events in any life cycle?
Answer key — Part A: 1) adult · 2) stage · 3) egg · 4) metamorphosis · 5) life cycle · 6) pupa · 7) larva · 8) reproduce
Part B: 1) Egg → caterpillar (larva) → chrysalis (pupa) → butterfly (adult). 2) A dramatic change in body form during an animal’s life cycle. 3) Birth (or hatching), growth, reproduction, and death.