6th Grade Notes pgs. 506-508 Mini Lab: modeling Cephalopod Propulsions Mollusks 6th Grade Notes pgs. 506-508 Mini Lab: modeling Cephalopod Propulsions

Review Now… Get out foldable from last week about flatworms/round worms. Characteristics Flatworms Roundworms Body Shape Body Openings Body Construction Digestive System Picture

Objectives Students will… Identify characteristics of mollusks Compare the similarities and differences between an open and a closed circulatory system

Tapeworms Type of parasitic flatworm To survive, it lives in the intestines of its host (including humans!) Since it does not have a digestive system, it absorbs nutrients from digested material in the host’s intestine. How do tapeworms get into humans? Tapeworm length activity

Videos Why parasites might not be all that bad Flatworms Roundworms

Mollusks (Conchs, Scallops, Snails, Octopus, Mussels) Characteristics of Mollusks Gills for water dwelling and lungs for land dwelling Radula- scratchy tongue like organ that has rows of fine, teeth-like projections that are used to scrape off small bits of food. Mantle- a thin layer of tissue that covers the mollusk’s soft body Shell for protection Foot is used for moving or for anchoring the animal Open circulatory system-do not have vessels to contain their blood. Blood washes over organs instead.

Mollusks pgs. 507-508 Types Gastropods Bivalves Cephalopods Where do they live? How many shells? Examples

Cephalopods Most complex type of mollusks (Nautilus, Octopus, Squid, Cuttlefish) Internal plate instead of shell Well-developed head and a “foot” that is divided into tentacles with strong suckers Closed circulatory system-in which blood is carried through blood vessels instead of surrounding organs Adapted for quick movement

For Next Time… What are the six main characteristics of mollusks? Read pgs. 508-511 Define open circulatory system and closed circulatory system on index cards.

Segmented Worms 6th Grade Pgs. 508-511

Do Now… Name the 3 types of mollusks. Give an example of each type.

Objectives Students will… Describe the characteristics of segmented worms Explain the digestive process of an earthworm

Mini Lab- Modeling Cephalopod Propulsion Purpose: To model cephalopod movement using balloons Lab Procedures/Directions Safety Precautions Answer lab questions in complete sentences

Segmented Worms Other name: Annelids Include: earthworms, leeches and marine worms Four Characteristics 1) Bodies are made of segments or rings 2) Coelom or internal body cavity (separates the internal organs from body wall)\ 3) Closed circulatory system 4) Complete digestive system with 2 body openings (pg. 509)

Earthworm Digestion Take soil in through mouth Soil moves to crop where it is stored In the gizzard, food and soil are ground. In the intestine, food is broken down and absorbed by the blood Undigested soil and waste leave the worm

Types of Segmented Worms Where Found Source of Energy An Interesting Characteristic Earthworm Leech Marine Worm

Videos Annelids Leeches

For Next Time… Complete Self Check questions #1-4 pg. 511 in science notebook Read pgs. 512-516