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ScienceInsects & MinibeastsAges 7–9

Insect life cycles: complete metamorphosis

Insect life cycles — complete metamorphosis in detail. Egg → larva → pupa → adult. The larva (caterpillar, grub, maggot) looks completely different from the adult. Inside the pupa the body is rebuilt. Butterflies, beetles, flies, and ladybirds all undergo complete metamorphosis.

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Complete metamorphosis has four stages: egg, larva, pupa and adult. A caterpillar is a butterfly larva. The larva eats and grows; body structures change during the pupal stage. The pupa is living, not a dead or simply sleeping adult. A chrysalis is a butterfly pupa; a cocoon is a covering made by some insects. Safety: No insect handling, breeding or purchased kits. Stop: Stop after the two paper life cycles. Do not collect eggs, rear insects or open a pupa.

Materials: Paper; Pencil 1. Draw four boxes in a ring. Copy the butterfly cards: egg—embryo develops; larva—caterpillar feeds and grows; pupa—adult structures develop while the body is reorganised; adult—butterfly can reproduce and lay eggs after mating. Add arrows to show the next generation. 2. Cover the stage names with folded paper edges. Read the descriptions and restore each name. Tell which stage eats and grows most in this simple comparison, and which is the main transformation stage. 3. Add a second ring for a ladybird beetle: egg → larva → pupa → adult. Write that a ladybird is a beetle, not an extra insect group outside beetles. Draw a long larva and a rounded adult as schematic shapes, not precise identification pictures. 4. Compare the two rings. Write one shared stage order and one difference in larval appearance. Correct this sentence: A caterpillar grows wings because it decides to fly. Use development rather than choice in the correction. Done: Finish two four-stage rings and correctly link larval feeding and pupal transformation to their stages. Proof: Keep the rings and corrected sentence. Note any stage names supplied while labels were covered. Stop: Stop after the two paper life cycles. Do not collect eggs, rear insects or open a pupa.

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US Forest Service · Practice link — not the full lesson

Butterfly Pollination

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Before you open · source notes

Butterfly Pollination supports Insect life cycles: complete metamorphosis. An adult previews and guides; this is a learning page, not a scored quiz.

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Public US Forest Service page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.

US Forest Service. “Butterfly Pollination.” External page; Gakuva does not copy, host, embed, or redistribute materials.

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Check understanding

  • Name the four stages of complete metamorphosis using the correct terms: egg, larva, pupa, adult
  • Explain that the larva stage is when the insect eats and grows, and the pupa stage is when its body transforms
  • Give at least two examples of insects that undergo complete metamorphosis such as butterflies and beetles
“Can your child explain the full life cycle of a beetle or butterfly using the proper words — egg, larva, pupa, adult — and tell you what happens at each stage?”

Curriculum record

Type
Conceptual
Subject
Science
Domain
Insects & Minibeasts
Age range
Ages 7–9

Standards

the-ontario-curriculum-science-and-technology-20:ON-SCI-2022-G2-B2.4