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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.

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Presentation on theme: "Roundworms & Segmented Worms 5 th Grade. Roundworms *live in any moist environment: --the beach --forest soils --Antarctic sands --pools of super hot."— Presentation transcript:

1 Roundworms & Segmented Worms 5 th 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 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 _of_the_mealworm.htm _of_the_mealworm.htm

19 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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