Exam 2

Question 1

Advantage to having a closed circulatory system

Answer 1

blood can reach further distances

Question 2

Aplacophora

Answer 2

worm-like body (vermiform)

no true shell = calcareous spicules on epidermis

radula pierce the prey

hermaphrodites or gonochorisitc

Question 3

Bivalia

Answer 3

CLAMS

2 shells connected by a hinge ligament

filter-feed

no radula

(anterior dorsal) umbo

2 siphons (incurrent-food/water and excurrent-waste)

hermaphrodite or gonochoristic

Question 4

Cephalopoda

Answer 4

closed circulatory system

head-foot

beak + radula

modified foot to forms arms and siphon

2 branchial hearts

1 systemic heart

heart at end of each gill to increase blood pressure

Question 5

Cephalopoda phylogeny

Answer 5

closed circulatory system

Question 6

Cephalopods unique

Answer 6

have cells to change colors
change texture of skin

Question 7

Phylum of Annelida

Answer 7

POH

Polychaeta

Clitellata

Oligochaeta

Hirudinea

Question 8

crystalline style

Answer 8

how bilvaliva feeds since they have radula

Question 9

Gastropoda

Answer 9

SLUGS/SNAILS

stomach foot

have operculum to prevent drying out

adults have torsion

use radula for feeding

hermaophrodites or gonochorisitic

Question 10

Gastropods are mostly

hermopadite or gonochoristic

Answer 10

hermopadite

Question 11

hemocoel

Answer 11

blood cavity that surrounds the heart

Question 12

Most mollusc are

hermaphrodite or gonochoristic

Answer 12

gonochoristic

Question 13

How bivalves use their gills for

Answer 13

ggg

Question 14

Mollusca defining characteristics

Answer 14

radula
muscular foot
mantle

Question 15

Mollusca gills are

Answer 15

bipectinate

Question 16

Monoplacophora

Answer 16

LIMPETS

single cap-like shell

3- 6 pairs of gills (ctnedia)

6-7 pairs of kidneys (nephridia)

scrapes up food on ocean bottom

gonochoristic

Question 17

Open circulatory system relies on

Answer 17

countercurrent exchange

Question 18

Order of Mollusca

Answer 18

PAM Gets Bold Starbucks Coffee

Polyplacophora—–Aplacophora—–Monoplacophora

Gastropoda—- Bivalvia —-Scaphopoda—- Cephalopoda

Question 19

Polyplacophora

Answer 19

CHITONS

8 plates + girdle (spicules for predation)

bipectinate gills (ctnedia)

incurrent (water in) / excurrent (waste)

counter current gas exchange

radula scrapes food

aesthetes for light receptors, chemoreceptors or mechanoreceptors

gonochorisitic

Question 20

Protostomes
Eucoelomates

Answer 20

Mollusca

Question 21

purpose of countercurrent exchange

Answer 21

saturate the blood with oxygen

Question 22

radula

Answer 22

rasping organ and can have iron-oxide
supported by the odontophore

Question 23

Scaphopoda

Answer 23

TUSK SHELL

tusk shaped conical shell open at both ends

(anterior) thread-like adhesive feeding tentacles (captacula) into the sediment

(posterior) exposed above sediment

gonochoristic

produces trochophore larvae

Question 24

Shell in mollusca made of

Answer 24

organic and inorganic material

Question 25

Gastropods carry their shell, if they have one, tipped to the

Answer 25

left (sinsitial)

Question 26

siphuncle

Answer 26

regulates amount of gas in the chamber

Question 27

trochophore larva

Answer 27

3 bands of cilia = produces the different parts of the animals

Question 28

veliger

Answer 28

second larval stage starts the formation of the shell common in the bivalves

Question 29

What member of the Cephalopods have a external shell

Answer 29

Nautilus

Question 30

Where is the coelomic cavity in the mollusca

Answer 30

hemocoel

Question 31

prostomium

Answer 31

before the mouth of the annelida

Question 32

Nephridia functions in annelids

Answer 32

discharging gametes discharging urine regulate water content of coelomic fluid

Question 33

Annelida with no segmentation

Answer 33

leeches sibs ech sip

Question 34

annelida with no chaetae

Answer 34

leeches sip

Question 35

annelida with no parapodia

Answer 35

oligochaetes leeches

Question 36

Errantia

Answer 36

well developed parapodia, most carnivores

Question 37

Sedentaria

Answer 37

reduced or highly modified parapodia, often tube dwellers

Question 38

oligochaetes are ## Footnote **gonochoristic or hermaphrodites**

Answer 38

hermaphrodites

Question 39

parapodia purpose in annelida

Answer 39

increases surface area for gas exchange

Question 40

siboglinids live in

Answer 40

chitinous tubes

Question 41

Why is it believed worms evolved from ancestors with protonephridia when most of them have metanephridia?

Answer 41

Most species have protonephridia in the larval stage even if while metanephridia is seen in adults.

Question 42

acicula

Answer 42

chitinous support rods that stiffens the parapodia

Question 43

annelida without digestive tract

Answer 43

sibs

Question 44

annelids without probscois

Question 45

Epitoke

Answer 45

mostly sexual reproduction with aesxual reproduction in some developed to help escape predation in species Polychaetes