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Roundworms & Segmented Worms

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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  1. Roundworms & Segmented Worms 5th Grade

  2. Roundworms *live in any moist environment: --the beach --forest soils --Antarctic sands --pools of super hot water

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

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

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

  6. One-way digestive tract is more efficient….why? • It enables the animal to absorb a large amount of the needed substances in foods

  7. Segmented Worms • Earthworms • Leeches • Sea-floor worms

  8. Segmented Worms

  9. 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

  10. Segmented Worms –closed circulatory system Closed circulatory system – blood moves only within a connected network of tubes called blood vessels

  11. Closed Circulatory System v Open Circulatory System

  12. 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

  13. 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

  14. 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?

  15. Surprise! Mealworms are NOT worms • Some organisms that LOOOK like worms are actually larvae

  16. Mealworms are actually the LARVA of a Darkling Beetle!

  17. Mealworms: • Live in cool or damp places • Could live in your cupboards –they are attracted to grain!

  18. Life Cycle of a Mealworm • http://www.newton.k12.ks.us/tech/life_cycle_of_the_mealworm.htm

  19. Mealworm Life Cycle • Egg 7–14 days • Larva 30–90 days -- 5 molts occur • Pupa 10–20 days • Adult 5–10 days Bran Apple • The cycle continues.

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