Invertebrates

Question 1

make up about ___ of all animals on earth

Answer 1

97%

Question 2

many are

Answer 2

aquatic

Question 3

the simplest of animals

Answer 3

sponges

Question 4

basal animal

Answer 4

no bilateral symmetry

Question 5

parazoans

Answer 5

no true tissues

Question 6

adult sponges are sessile but larvae have

Answer 6

motility (will settle on substrate and grow)

Question 7

sponges have no

Answer 7

digestive, respiratory, circulatory, reproductive, or nervous systems

Question 8

sponges reproduce

Answer 8

asexually- through budding
sexual- hermaphroditic, release egg and sperm into the water

Question 9

annelida

Answer 9

segmented worm- repeated body segments, most advanced worms, complete digestive system, etc.

Question 10

nematoda

Answer 10

sexually dimrphic worm, pseudocoelomates

Question 11

platyhelminthes

Answer 11

flat worms
some are free-living, some are parasitic

Question 12

mollusca

Answer 12

predominately marine, snails clam, octopus

Question 13

four classes in mollusca

Answer 13

polyplacophora
Gastropoda
Bivalvia
cephalopoda

Question 14

polyplacophora

Answer 14

chiton- 8 piece shell (valves)

Question 15

gastropoda

Answer 15

snails, slugs, conchs, nudibranchs

Question 16

bivalvia

Answer 16

two halves of shell,
clams, oysters, scallops

Question 17

cephalopoda

Answer 17

octopus, squid, nautilus

Question 18

cnidaria

Answer 18

jellyfish, sea anemone, corals

primitive nervous system- nerve net

gastrovascular cavity-one opening, serves as both mouth and anus

Question 19

cnidaria 2 distinct body plans

Answer 19

polyp-sessile
medusa- jellyfish

some display both body plans during the life cycle

Question 20

anthozoa

Answer 20

corals, sea anemones
polyp body plan

Question 21

scyophozoa

Answer 21

jellyfish- medusa form is prominent

Question 22

Arthropoda

Answer 22

jointed legs
dominates the animal kingdom (about 85%)
exoskeleton made of chitin

Question 23

crustacea

Answer 23

mostly aquatic
gills
covering is carapace