3/24/14 Mr. Faia 6th Grade Science WORMS 3/24/14 Mr. Faia 6th Grade Science

What Worms Have in Common 3 Major types of worms: Flatworms Roundworms Segmented Worms

What Worms Have in Common 3 Major Phyla: Platyhelmenthes Nematoda Annelida

What Worms Have in Common All worms are invertebrates Long, narrow bodies No legs

What Worms Have in Common Worms have a brain Brain and sense organs are found in the head end

What Worms Have in Common Worms can reproduce sexually and asexually How can they reproduce asexually? What is regeneration?

Flatworms Soft bodies Most flatworms are parasites What is a parasite?

Flatworms Tapeworms live in intestines of other animals Can grow to 10 to 12 meters long

Flatworms Planarians are scavengers Planarians also have eyespots What is a scavenger? What are eyespots? How do planarians digest food?

Roundworms How many roundworms can live in a square meter of sand? How do roundworms get food?

Roundworms Roundworms have a digestive system that is a tube at both ends

REVIEW!!! What type of symmetry do worms have? What are the 3 types of worms? What are the 3 phyla of worms? How do worms reproduce? Define regeneration. What is a tapeworm and how does it get food? How do planarians ‘see’? How do roundworms get energy?

Roundworms 1-way digestive systems are like an assembly line Each part of the process happens at a different stop This allows the animal to absorb more nutrients

Segmented Worms Found in most environments Live in burrows or tubes Many are predators

Segmented Worms These worms are made up of linked segments Earthworm usually has over 100 segments

Segmented Worms Every section has tubes that remove wastes Nerves and a digestive tube run the length of the body Reproductive organs are only in some sections, not all

Segmented Worms Segmented worms have a closed circulatory system What might this mean? What else has a closed circulatory system?

Segmented Worms In segments 9 through 13, the worm has “hearts” to pump blood These pump blood through the body

Segmented Worms Earthworms are scavengers They come to the surface at night Why? Bristles help the worm move

Segmented Worms

Earthworms Mouth – Crop – Gizzard – Intestines -

Earthworms Brain – Ventral Nerve Cord – Dorsal Nerve Cord -

Earthworms Hearts – Blood Vessels

Earthworms Bristles –

REVIEW Part 2!!! List the 3 major phyla of worms? How does a tapeworm obtain food? Describe an earthworms body. What kind of circulatory system does an earthworm have? Which segments are the earthworms “hearts” found? What digests dirt in an earthworm?