Special Sub-Topic: I Mollusca ! Authored by: zorr Sub-topic of: Mollusks

Which of the following groups of animals belong to the phylum Mollusca?

slug, squid, scallop. Mollusks are a group of soft bodied but very diverse creatures.

An organ that is characteristic of some mollusks is the?

radula. Gastropods and Chitons use a radula to 'lick' their food. It is a tongue that contains teeth to scrape off plant or animal material.

Which of these correctly specifies the 3 distinct body zones of a mollusk?

foot, visceral mass, mantle. The foot of a mollusc may be modified to become tentacles.

Mollusk shells are secreted by the?

mantle. Not all Mollusks have a shell. For example slugs, nudibranchs, octopus.

The group of Mollusks that are generally considered to be the most intelligent are the?

Cephalopods. The cephalopods include the squid, octopus, cuttlefish and nautilus.

Respiration in aquatic mollusks is carried out by?

gills. Gills are widely used by aquatic animals for respiration.

Excretion of metabolic wastes in mollusks is carried out by the?

nephridia. The nephridia are commonly seen in many of the invertebrates.

The type of larva seen in all mollusks is the?

trochophore. The trochophore larva is characteristic of both mollusks and annelids.

Which two of the following groups have a radula?

Polyplacophora and gastropoda. The radula is a tongue like structure with teeth that can scrape algae off of rocks or eat your plants.

The snail the clam and the squid all have one large common feature in common. It is the?

Foot.