Phylum Molluska

Question 1

beak

Answer 1

oral feeding structure cephalopods

Question 2

molluscus

Answer 2

soft bodied

Question 3

bilateral

Answer 3

having two identical halves

Question 4

jet propulsion

Answer 4

mode of locomotion for octopi and squid

Question 5

bioremediation

Answer 5

using organisms to clean up the environment

Question 6

closed circulatory system

Answer 6

blood never leaving the blood vessels

Question 7

class cephalopods

Answer 7

“head-foot” soft bodied, having tentacle foot for predation, head attached to a single foot, foot divided into tentacles with suckers. nautiluses do not have suckers but have sticky mucus covering. small internal shell except for nautiluses. octopi have no shell, complex sensory organs. been here for 500 million years.

Question 8

open circulatory system

Answer 8

simple heart blood pumps through vessel, system in which blood leaves the blood vessels to fill different body sinuses (sac-like spaces). blood passes from sinuses to gills for gas exchange. returns to hear and ideal for slow moving animals.

Question 9

visceral mass

Answer 9

consists of internal organs

Question 10

filter feeder

Answer 10

mode of nutrient gathering for oysters and other bivalves

Question 11

class Gastropoda

Answer 11

“stomach foot” includes snails, slugs and nudibranches, shell-less or single-shelled. moves via muscular foot on ventral side. (pondsnails, land slugs, limpets, sea hares, sea butterflies, marine slugs (nudibranches).

Question 12

radula

Answer 12

structure used for feeding, flexible tongue shaped structure in slugs and snails

Question 13

mantle

Answer 13

thin layer of tissue covering most of the mollusk body

Question 14

siphon

Answer 14

tube-like structure through which water enters and leaves the body, direct water from gills which captures plankton in mucus cilia moves food into mouth.

Question 15

class bivalves

Answer 15

having two shells held together with powerful muscles. (clams, oysters, mussels, scallops). filter feeders, sedentary life style.

Question 16

chitons

Answer 16

protective structures of calcium carbonate

Question 17

trochophore

Answer 17

free-swimming larvae

Question 18

phylum - molluska

Answer 18

invertabrates
shell-fishes
molluscus - soft-bodied
external or internal shell
organisms included: snails, slugs, clams, oysters, squids, octopi.
been around for 550 million years

Question 19

form and function

Answer 19

colem

complex organ system

Question 20

body plan

Answer 20

has four parts

1. foot
2. mantle
3. shell
4. visceral mass

Question 21

foot

Answer 21

many forms and functions, flat shaped for crawling, sad-shaped structures for burrowing, tentacles for capturing

Question 22

shell

Answer 22

made by glands in mantle, secretes calcium carbonate, some have shed the shell (slugs)

Question 23

feeding

Answer 23

herbivores - scrape algae, carnivores- drill through shells, tear tissue of prey, filter feeders, parasitic, detritivores. many teeth attached, octopi produce toxins to paralyze prey. clams and oysters filter feed using feathery gills.

Question 24

respiration

Answer 24

aquatic mollusks use gills inside mantle cavity, land snails respire via surface of mantle cavity lined with blood vessels. gases diffuse across surface area. needs to be moist.

Question 25

circulation

Answer 25

oxygen and nutrients carried throughout body via open or closed circulatory system.

Question 26

excretion

Answer 26

cells released nitrogen-containing wastes into blood. Nephridia remove ammonia from blood to be released out of the body.

Question 27

response

Answer 27

simple nervous system in clams and other bivalves. small ganglia near mouth, few nerve cords. simple sense organs (chemical receptors), (eye spots). complex systems in octopi and relatives, octopi have highly developed brains - highly intelligent. most developed nervous system of all invertebrates.

Question 28

movement

Answer 28

snails crawl along foot which secretes mucus. octopi use jet propulsion with water drawn into mantle cavity and then forced out through siphon.

Question 29

reproduction

Answer 29

most snails and bivalves reproduce sexually. release sperm into water which fertilizes eggs externally. eggs develop into free-swimming larvae. tentacle mollusks and come snails have internal fertilization. some mollusks are hermaphoditic.

Question 30

ecology of mollusks

Answer 30

eat detritus, filter algae- from water. some ahem symbiotic relationships with algae, bacteria, or parasites. some are parasitic, food for many organisms. bioremediation, medical application for finding cure for cancer - mollusks never have cancer.

Question 31

Foot

Answer 31

Versatile body part with various form and function

Question 32

Ctenidium

Answer 32

Feathery gills of squids

Question 33

Nautilus

Answer 33

Shelled cephalopods

Question 34

Lateral fin

Answer 34

Stabilizing appendages of a squid

Question 35

Octopus

Answer 35

Shell-less mollusk

Question 36

Nephridia

Answer 36

Tube shaped structure for removing nitrogenous wastes