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 5th 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
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? • It enables the animal to absorb a large amount of the needed substances in foods
Segmented Worms • Earthworms • Leeches • Sea-floor worms
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 Closed circulatory system – blood moves only within a connected network of tubes called blood vessels
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 • 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 • What type of worms are they? • Are they nocturnal or active during the day time? • Where do they live?
Surprise! Mealworms are NOT worms • Some organisms that LOOOK like worms are actually larvae
Mealworms: • Live in cool or damp places • Could live in your cupboards –they are attracted to grain!
Life Cycle of a Mealworm • http://www.newton.k12.ks.us/tech/life_cycle_of_the_mealworm.htm
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.