1. Describe the mollusc body plan. Make a table that compares and contrasts the molluscan features; head, shell, mantle, foot in the five classes of molluscs you studied in lab. body plan: foot, visceral mass, and mantle 2. Describe how the foot is adapted for locomotion in a: Snail- the long muscular foot secretes a layer of slime that helps the foot move Chiton- flat and wide helps hold onto rocks, articulating valves help Octopus- uses muscular mantle to draw in water and force it out for propulsion 3. What is a radula used for? Used for feeding in mollusca. Helps scrape food before entering esophagus 4. Which group of mollusks has a closed circulatory system? Class Cephalopoda
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Step 1: Identify the five classes of molluscs to be compared: Polyplacophora (chitons), Gastropoda (snails), Bivalvia (clams), Cephalopoda (octopuses), and Scaphopoda (tusk shells). Show moreā¦
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List the three main types of the mollusc body plan. List one defining feature of Gastropoda, Cephalopods, and Polyplacophora. Compare the features of the Phyla Mollusca, Platyhelminthes, Annelida, Nematoda, and Arthropoda. Identify the main characteristics of each Phylum. List three defining features of Phylum Arthropoda that are not found in other Phyla. List the unique features of echinoderms. List the four ancestral characters of chordates. For vertebrates, identify the clade in which jaws evolved and the clade in which mineralized teeth and a partially mineralized skeleton evolved. Also, identify the clade in which a fully mineralized skeleton and lungs evolved. List the features that evolved in tetrapods that allowed them to adapt to life on land.
Madhur L.
5. The concentric rings on the shells of mollusks are referred to as growth rings. Which part of the shell do you suppose forms first? (i.e. which is the oldest section of the shell?) 6. Which part of the shell corresponds to its orientation? 7. What is the process in which pearls are made? 8. Briefly describe the function of the: a. Mantle b. Adductor muscles c. Foot d. Gills e. Visceral mass 9. What determines the direction of the shell coiling? 10. When a snail is crawling about, what parts of its body are outside the confines of the shell? 11. What is the operculum? 12. Does the operculum completely seal of the snail's body from its surroundings when the animal is disturbed? Is the operculum continuous with the shell itself? 13. Snails and slugs tend to leave a slime trail when moving around. What is the Purpose of this 14. How is the mantle of a squid different than that if a clam?
Sri K.
Describe the morphology and anatomy of mollusks.
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