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Roundworms & Segmented Worms. 5 th Grade. Roundworms. *live in any moist environment: --the beach --forest soils --Antarctic sands --pools of super hot water . Did you Know ? About a million roundworms live in each square meter of damp sand.

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Roundworms & Segmented Worms

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Roundworms segmented worms

Roundworms & Segmented Worms

5th Grade



*live in any moist environment:

--the beach

--forest soils

--Antarctic sands

--pools of super hot water

Did you know about a million roundworms live in each square meter of damp sand

Did you Know? About a million roundworms live in each square meter of damp sand

Roundworms have a digestive system like a tube open at both ends

Roundworms have a digestive system like a tube --open at both ends

Roundworm digestive system

Roundworm digestive system

  • Food enters the roundworm’s mouth and exists through an opening called the anus at the far end of the tube

One way digestive tract is more efficient why

One-way digestive tract is more efficient….why?

  • It enables the animal to absorb a large amount of the needed substances in foods

Segmented worms

Segmented Worms

  • Earthworms

  • Leeches

  • Sea-floor worms

Segmented worms1

Segmented Worms

Segmented worms2

Segmented Worms

  • Have bodies made up of a series of rings separated by grooves

  • Have bodies made up of many linked sections called segments

  • Also have a one-way digestive system

Segmented worms closed circulatory system

Segmented Worms –closed circulatory system

Closed circulatory system – blood moves only within a connected network of tubes called blood vessels

Closed circulatory system v open circulatory system

Closed Circulatory System v Open Circulatory System

Earthworms in the environment

Earthworms in the Environment

  • Earthworms tunnel through the ground for a living

  • They must stay in moist soil or damp air to keep their skin moist ---they breathe through their skin

Benefits to gardening

Benefits to Gardening

  • Earthworm tunneling loosens the soil, allowing air, water and plant roots to move through

  • Earthworm droppings make the soil more fertile

  • Earthworms bring nutrients to the surface of the soil through their waste

Observe the mealworms and pass them around the class

Observe the Mealworms and pass them around the class

  • What type of worms are they?

  • Are they nocturnal or active during the day time?

  • Where do they live?

Surprise mealworms are not worms

Surprise! Mealworms are NOT worms

  • Some organisms that LOOOK like worms are actually larvae

Mealworms are actually the larva of a darkling beetle

Mealworms are actually the LARVA of a Darkling Beetle!



  • Live in cool or damp places

  • Could live in your cupboards –they are attracted to grain!

Life cycle of a mealworm

Life Cycle of a Mealworm


Roundworms segmented worms

Mealworm Life Cycle

  • Egg7–14 days

  • Larva30–90 days --5 molts occur

  • Pupa10–20 days

  • Adult5–10 daysBranApple

  • The cycle continues.

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