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Chapter 30 unit

QuestionAnswer
Mollusks and annelids are thought to have been the first major group of organisms to develop a TRUE COELOM. TRUE.
While all but one group of mollusks have an open circulatory system, ALL ANNELIDS have a closed circulatory system. TRUE.
Because cephalopods have tentacles they have A NEED for a radula. TRUE.
Mollusk DO NOT eat constantly because nephridia recovers useful molecules as well as waste products. TRUE.
Oysters and other bivalves appears when? Sand becomes lodges between their mantle and shell.
All of the following are characteristics of mollusks except? A pseudocoelomate body plan.
In anillids a significant change in body plan is? Segmentation.
The advantage of a close circulatory system over an open circulatory system is that? Blood moves more efficiently through a closed circulatory system.
In order to digest the nutrients in soil the earth worms must? Grind the soil in their gizzard.
Polychaetes or marine worms may have parapodia which? All of the above.
Bivalves open and close their valves by? Contracting and relaxing the adductor muscles.
Earth worms must stay moist because they? Respire through skin.
Structure A is? Gills and they are used for respiration.
Structure B is ? Coelom and it collects waste laden fluids.
Structure C is the ? Mantle.
Structure D is the? Stomach.
The ___ larva is a distinguishing characteristic of mollusks and annelids. Trochophore.
In annelids, ____ divide body segments while ____ help the animal move from place to place. Septa and Setae.
Constant beading of ____ in the mantle cavity of mollusks causes a continuous stream of water to pass over the gills. Cilia.
Water is drawn into the body of bivalves through tubes called ____. Siphons.
Annelids have a _____ which is a primitive brain. Cerebral ganglion .
Another feature shared by many mollusks and annelids is a larval stage called a ____ which develops from the fertilized egg. Trochophore. WB
Before leaving the body, this fluid passes into tiny tubular structures called ____. Nephridia. WB
Mollusks have many organ systems, which are contained in the ___. Visceral mass. WB
A ____ wraps around the visceral mass. Mantle. WB
Every mollusk has a muscular region called a ____. Foot. WB
All mollusks except bivalves have a rasping rough like organ called a ____. Radula. WB
Most annelids have external bush bristles called ____. Setae. WB
Some annelids have fleshy appendages called _____. Parapodia. WB
Two thick ____ connect the valves and when contracted they cause the valves to close tightly. Anductor muscles. WB
Once there the celia on their gills draw in sea water through hollow tubes called _____. Siphons. WB
A well developed primitive brain called a _____ is located in one interior segment. Cervical ganglion. WB
External body walls called ___ separate the segments of many animals. Septa. WB
Created by: ava-barnhill
 

 



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