Unit 4 test

Question 1

Foot

Answer 1

Muscle; function varies

Question 2

Radula

Answer 2

toothy tongue

Question 3

Poly
Placo
Phora

Answer 3

Poly - many
Placo - plates
Phora - Carrier

Question 4

Chitons

Answer 4

8 shells on dorsal side. And the shell surrounded by the mantle. They eat algae off rocks

Question 5

Gastropoda - meaning of name

Answer 5

Gastro - stomach
Poda - foot

Class members - snails, sea slugs

Question 6

Herbivore (Gastropoda)

Answer 6

Eats algae or benthic diatoms

Question 7

Carnivore (Gastropoda)

Answer 7

Eats other mollusks, sea urchins, fish, barnacle, worms, sponges, sea anemones

Question 8

Deposit feeder (Gastropoda)
Scavenger

Answer 8

Deposit Feeders - Eat organic material such as minerals deposited on the sea floor.

Scavengers - eat larger particles.

Question 9

Filter feeder (Gastropoda)

Answer 9

Pump water over their gills and feed off of the free floating algae, filtering the water.

Question 10

Nudibranchs

Answer 10

Gastropoda that lack a shell. Usually are colored and have bizarre shapes. The more surface are they have, the more gas exchange, by using the Cerata.

They feed on Cnidarians and keep the nematocysts for their own use by putting them in their tips of the cerata.

Question 11

Bivalvia

Answer 11

meaning of class names: Bi = two, Valva = door

Class members - mussels, oysters, clams, scallops

Characteristics - 2 shells, no radula, siphons for feeding.

They are found on soft to hard surfaces.
The bissus allows mussels to stick to hard surfaces. The byssal allows oysters to burrow and run away.

Scallops lie in the sand or mud and use jet propulsion.

Open circulatory system - heart pumps blood through open spaces called sinuses instead of blood vessels.

Nervous system of Bivalves are reduced because they have no head.

Question 12

Nervous System

Answer 12

Nervous system of Bivalves are reduced because they have no head.

Gastropods - fairly basic

Cephalopods - very well developed. And have good vision, small ganglia near mouth, balance, simple chemical and touch receptors. Good dexterity and memory.

Question 13

Musculoskeletal system

Answer 13

Bivalves - two shells, foot pulls animal forward and can retract for protection.

Gastropods - have a stomach foot which they use to slide forward.

Cephalopods - have a foot that has been modified into many tentacles with suction cups.

Question 14

Reproductive system for mollusks

Answer 14

Separate sexes. External fertilization. Internal fertilization. Present in cephalopods and gastropod.