Lab 8

Question 1

filter feeder

Answer 1

consume small pieces of matter sifted from water

Question 2

detritovore

Answer 2

consuming decomposing animal and plant tissue

Question 3

bilateral symmetry

Answer 3

defined right and left halves

Question 4

two germ layers

Answer 4

ectoderm, endoderm,

Question 5

three germ layers

Answer 5

ectoderm, endoderm, mesoderm

Question 6

ectoderm

Answer 6

outer covering and nervous system

Question 7

endoderm

Answer 7

digestive system

Question 8

mesoderm

Answer 8

skeleton and muscles

Question 9

acoelomate

Answer 9

solid body and no coelom

Question 10

pseudocoelomate

Answer 10

coelom partially lined by mesoderm

Question 11

coelomate

Answer 11

coelom completely lined by mesoderm

Question 12

what is the difference between the tract and cavity of a digestive system

Answer 12

tract is when there are two openings with a separate moth and anus and cavity us when there is only one opening

Question 13

open circulatory system

Answer 13

fluid passes between vessels to chambers

Question 14

closed circulatory system

Answer 14

fluid is contained to vessels

Question 15

what are the different organs that allow for gas exchange

Answer 15

skin
gills
lungs

Question 16

what are the ways animals can remove nitrogen waste

Answer 16

diffusion in skin
nephridia
kidneys

Question 17

hydrostatic skeleton

Answer 17

cavity pressurized with fluid

Question 18

exoskeleton

Answer 18

tough external skeleton with little flexibility

Question 19

endoskeleton

Answer 19

internal skeleton composed of bone and cartilage

Question 20

what phylum have all radial symmetry

Answer 20

cnidaria (hydra)

Question 21

what are the four characteristic features of class Mollusca

Answer 21

1. hard external shell
2. thin layer of tissue called the mantle
3. a visceral mass that contains most organs
4. muscular foot for locomotion

Question 22

what is the purpose of the osculum in the porifera

Answer 22

outlet for the current of water passing through body wall

Question 23

what is the purpose of the two cerebral ganglia in planaria

Answer 23

acts as the brain

Question 24

what is the symmetry for class planaria

Answer 24

bilateral

Question 25

prostomium of the earthworm

Answer 25

flap of skin covering the mouth

Question 26

nephridia of the earthworm

Answer 26

organ specialized for excretion of waste

Question 27

what type of symmetry does a clam have

Answer 27

bilateral

Question 28

what is the function of the incurrent and excurrent siphons in the clams

Answer 28

filter water

Question 29

what does the nephridia remove

Answer 29

nitrogenous waste

Question 30

what is the difference between the cephalothorax and abdomen

Answer 30

cephalothorax is where the animal’s head and thoracic organs are found, while the abdomen contains digestive and reproductive structures

Question 31

what is the function of the chitinous teeth that line the stomach in crayfish

Answer 31

grinding mechanism

Question 32

what type of circulatory system do crayfish have

Answer 32

open

Question 33

what type of symmetry is the starfish

Answer 33

radial