BSC 2011L Online, Exercise 8, Lophotrochozoan Protostomes

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What are the general characteristics of mollusks?

Bilaterally symmetrical, coelomate, with a mantle, visceral mass, and muscular foot.

What are the three classes of Phylum Mollusca?

Class Gastropoda, Class Polyplacophora, and Class Bivalvia.

What is a key characteristic of the circulatory system in Class Cephalopoda?

Closed circulatory system.

What is the primary function of the muscular foot in mollusks?

Locomotion.

What type of body symmetry do annelids exhibit?

Bilateral symmetry.

Which class of mollusks is known to have 'many plates'?

Class Polyplacophora.

What are the main respiratory structures in mollusks?

Gills.

How do annelids excrete waste?

Through nephridia.

What distinctive feature do bivalves lack compared to gastropods?

A distinct head and radula.

Which mollusk class includes creatures like squids and octopuses?

Class Cephalopoda.

What is the function of the nephridium in mollusks?

Excretion.

What is a common habitat for both mollusks and annelids?

Marine, freshwater, and terrestrial environments.

In which phylum do earthworms belong?

Phylum Annelida.

What is the function of the aortic arches in earthworms?

They function as hearts, helping in circulation.

What type of skeleton do annelids possess?

Hydrostatic skeleton.

Describe the digestive system of mollusks.

They have a complete digestive system.

What reproductive trait do some members of both mollusks and annelids share?

Some are hermaphrodites.

How do cephalopods differ from other mollusks in terms of locomotion?

They have a muscular foot that is divided into tentacles.

What characteristic do annelids have that mollusks do not?

Segmentation.

What is the primary role of the mantle in mollusks?

To secrete the shell and provide protection.

Identify one key characteristic of Class Hirudinea within Phylum Annelida.

Leeches that produce an anticoagulant.

What type of circulatory system do annelids possess?

Closed circulatory system.

What structures do mollusks use for respiration?

Gills.

What unique ability have cephalopods demonstrated that sets them apart?

They have shown some 'intelligence.'

What anatomical feature distinguishes Class Gastropoda?

Presence of a distinct head and a radula.

What are the main locomotion muscles in annelids?

Circular and longitudinal muscles.

Describe the general habitat of mollusks.

They can be found in marine, freshwater, and terrestrial environments.

The class of mollusks known for having a spiral shell is called ______.

Gastropoda.

The excretory structure found in both mollusks and annelids is called a ______.

nephridium.

Cephalopods are recognized for their ability to ______ in aquatic environments.

swim.

Mollusks primarily breathe through ______ located in their gills.

oxygen.

The hard protective outer layer produced by the mantle of mollusks is called a ______.

shell.

The term used to describe animals with a body divided into segments is ______.

segmentation.

Annelids, along with mollusks, belong to the larger grouping of ______ animals.

coelomate.

Bivalves do not possess a ______, which distinguishes them from gastropods.

radula.

The locomotion in annelids is primarily achieved by the contraction of ______ muscles.

circular and longitudinal.

The organ in cephalopods that functions similarly to a beak is used for ______.

feeding.