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Use the notes and Chapter 16 to answer the following questions. Unit 4: Assignment 1: Objective 1 Question 1 1 pts The active area containing the feeding, cephalic sensory, and locomotor organs. It depends primarily on muscular action for its function. head-foot mantle visceral mass radula Question 2 1 pts The portion containing digestive, circulatory, respiratory, and reproductive organs, and it depends primarily on ciliary tracts for its functioning. radula visceral mass head-foot mantle Question 3 1 pts a protective outgrowth consisting of two folds of skin on the dorsal body wall. mantle shell periostracum visceral mass Question 4 1 pts A series of microfilaments which absorb oxygen from the water. radula visceral mass lung gills Question 5 1 pts. Some mollusks produce a protective hard __________ over the visceral mass. Three layers - Outer layer (Periostracum); Composed of hardened protein -Middle prismatic layer; Closely packed prisms of calcium carbonate and increases with animal growth -Inner nacreous layer; Next to the mantle; the nacre is laid down in thin layers Aids in Pearl formation; Shiny layer in abalone, nautilus, and bivalve shell visceral mass mantle radula Question 6 1 pts A rasping protrusible, tongue-like organ found in all molluscs except bivalves and most solenogasters. It is a ribbon-like membrane on which are mounted rows of tiny teeth that point backward. visceral mass mantle shell radula Question 7 1 pts Includes a pumping heart, blood vessels and blood sinuses. Blood is pumped from the heart into open spaces. protostome open circulatory system closed circulatory system coelom Question 8 1 pts Organisms with separate sexes (male and female individuals) dioecious Solenogasters hermaphrodite protostomes Question 9 1 pts There are this many living species of Molluscs 90,000 9,000 900,000 900 Question 10 1 pts ALL molluscs are protostomes True False Question 11 1 pts Mollusks can live in marine and freshwater environments. They cannot live on terrestrial environments. True False Question 12 1 pts Fossil evidence shows that molluscs evolved in the sea. True False Question 13 1 pts The visceral mass contains digestive, circulatory, and reproductive organs. True False Question 14 1 pts The space between mantle (sheath of skin) and body wall is the mantle cavity. Mantle cavity houses the gills or a lung. True False Question 15 1 pts ALL mollusks secrete a shell over their mantle. True False Question 16 1 pts A twisting phenomenon in gastropod development that alters the position of the visceral and pallial organs by 180 degrees shell mantle diocious Torsion Question 17 1 pts A mode of reproduction in animals in which embryos that develop inside eggs remain in the mother's body until they are ready to hatch. diocious anadromous hermaphrodite ovoviviparity Question 18 1 pts Cephalopods (squids and octopuses) have a closed circulatory system. True False Question 19 1 pts Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. True False
