Teacher sheet · Ages 10–11 · about 45–50 minutes
The world of insects
Lesson page: echoesof.science/school/insects/ages-10-11/ · Pupil worksheet: echoesof.science/school/insects/ages-10-11/print/
Learning aims
- Identify insects by their body plan and distinguish them from other arthropods.
- Explain moulting and compare complete and incomplete metamorphosis.
- Know that insects are extremely diverse and numerous.
- Explain why insects matter to people and ecosystems.
Lesson plan
| Time | Activity |
|---|---|
| 5 min | Starter: is a spider an insect? Vote and justify. |
| 10 min | Read the text; draw the two life cycles. |
| 15 min | Set the pitfall traps (day 1). |
| 30 min | Sort and count the catch, release (day 2). |
| 5 min | Complete or incomplete? game or quiz. |
Materials for the experiment
- A clean plastic cup or yoghurt pot (with a few small holes in the bottom)
- Trowel
- A few dead leaves
- A small flat piece of wood or tile and four stones as a roof
- White tray, spoon, paintbrush, hand lenses
- Recording sheet
Safety: An adult chooses the spot and checks for hazards. Wear gloves when digging, handle animals gently with a spoon or brush, do not leave the trap for more than one night, release every animal, and wash your hands afterwards.
Common misconceptions
| Pupils may think… | Actually… |
|---|---|
| Caterpillars and butterflies are different animals. | A caterpillar is the larva of a butterfly; it becomes an adult through a pupa. |
| Insects grow gradually like people. | Their exoskeleton cannot grow, so they grow in steps by moulting. |
| Insects breathe through their mouths. | Most breathe through spiracles on the sides of the body. |
Worksheet answers
- Head (antennae attached), thorax (six legs and any wings attached), abdomen.
- Egg → caterpillar (larva) → chrysalis (pupa) → butterfly (adult).
- Accept class data; insects identified by having six legs.
- Any two: pollination of crops and wild plants; breaking down dead material and recycling nutrients; food for birds, fish and mammals; natural pest control (ladybirds eat aphids); honey and wax.
Quiz answers
- Which of these is true of all insects? Six legs and three body parts. Head, thorax, abdomen and six legs.[1]
- What is an exoskeleton? A hard covering on the outside of the body. Arthropods have their skeleton on the outside.[1]
- Why does a young insect moult? Its exoskeleton cannot grow. It sheds the old exoskeleton and forms a bigger one.[4]
- Which life cycle is complete metamorphosis? Egg, larva, pupa, adult. Butterflies, beetles and bees develop like this.[4]
- How do most insects breathe? Through spiracles on the sides of the body. Spiracles are small holes along the body.[3]
- About what share of crops grown in Europe rely on pollinators? 84%. Bees, flies, beetles and others pollinate them.[6]
Going further
Set traps in two places (for example under a hedge and on a mown lawn). Which place catches more kinds of insects? How could you make the comparison fair?
Sources used in this lesson
- [1] What is an insect? (Smithsonian National Museum of Natural History): reliability High
- [2] Numbers of insects (species and individuals) (Smithsonian Institution (Encyclopedia Smithsonian)): reliability High
- [3] Insect anatomy (Museum of the Earth (Paleontological Research Institution, Ithaca)): reliability High
- [4] Insect life cycles (fact file) (Amateur Entomologists' Society): reliability Medium-high
- [6] What is entomology? (Royal Entomological Society): reliability High
- [7] How to make a pitfall trap to catch insects (Natural History Museum, London): reliability High
Full list with links and a note on each source's reliability: echoesof.science/school/insects/sources/
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