Ch 33: Invertebrates - Molusca

Question 1

Mollusca examples are

Answer 1

balone, clams, mussels, octopus, oysters, squid, and scallops

Question 2

Mollusca general characteristics are

Answer 2

unsegmented soft body.
most have internal or external shell.
have a mantle - a fold in the body wall that secretes the hard prtesctive shell.
muscular foot and/or tentacles.
have a radula - a toothed structure used to grate food.
two pairs of gills except in polmonate snails.

Question 3

_______ _______– the internal area in which the digestive, excretory, and reproductive organs are concentrated

Answer 3

Vissceral mass

Question 4

_________ – a special type of excretory structure that removes nitrogenous waste

Answer 4

hephrida

Question 5

_______ – muscular structure used for locomotion or capturing prey.

Answer 5

muscular foot

Question 6

_________– thick epidermal sheet that covers the dorsal side of the body and forms a cavity in which the respiratory organs are housed along with openings for systems within the visceral mass

Answer 6

Mantle

Question 7

_________ – respiratory gills that consist of filamentous projections of the mantle that are rich in blood vessels.

Answer 7

ctenidia

Question 8

___ are secreted by ___ and used for protection

Answer 8

shells, mantle

Question 9

toung like organ used for eating is called

Answer 9

Radula

Question 10

most have a ___ circulatory system

Answer 10

open

Question 11

which mollusks have a closed circulatory system,

Answer 11

Cephalopods

Question 12

Reproduction Varies: t or f?

Answer 12

t. Most have separate sexes, but some are hermaphroditic. Most have external fertilization, while some have internal fertilization.

Question 13

reproduction: all have ____

Answer 13

Trochophore - free swimming larva

Question 14

reproduction: Gastropods have a second free swimming larva. this is called___

Answer 14

Veliger

Question 15

what are the 4 classes of mollusca?

Answer 15

polyplacophora
gastropoda
bivalves
cephalopods

Question 16

Class: polyplacophora are ___

Answer 16

chitons

Question 17

chitons characteristics

Answer 17

marine “pill bugs” have 8 overlapping cavities and live in water

Question 18

Class: Gastropoda examples

Answer 18

snails and slugs

Question 19

Gastropoda have torsion, meaning ___

Answer 19

a process by which the mantle cavity and anus are moved from a posterior location to front of the body closer to where the mouth is located.

Question 20

are Gastropoda Bilateral? why?

Answer 20

no. due to torsion

Question 21

Class: Bivalve example

Answer 21

clams, oysters, scalps, muscles

Question 22

Class: Cephalopod examples

Answer 22

octopus, squid, cuttlefish, noutilues

Question 23

Cephalopods Have highly developed ____

Answer 23

nervous systems and exhibit complex patterns of behavior

Question 24

Cephalopods Expel water through a siphon for

Answer 24

jet proportion movement

Question 25

Many Cephalopods have an ink sack that

Answer 25

can be expelled through their anus to confuse predators

Question 26

t or f Molluscs make up 40% of all documented extinction.

Answer 26

t