Week 4

Question 1

nematoda characteristics

Answer 1

can be free living in freshwater, saltwater or terrestrial habitats, can also be parasitic
epidermis is externally covered by a cuticle
only have longitudinal muscles
pseudocoelmates

Question 2

cuticle

Answer 2

layer of nonliving material that can be sued for water retention, some protection, and helping to keep their round shape

Question 3

what is the most important feature of cuticle for roundworms

Answer 3

water retention

Question 4

do nematodes move more sporadically

Answer 4

yes

Question 5

pseudocoelomates

Answer 5

hollow space inside their body, but isn’t lined with peritoneum

Question 6

Ascaris lumbriocoides characteristics

Answer 6

the giant human roundworm
common intestinal parasite in humans
females generally larger than males
males are usually smaller and have a curved posterior 
have a separate mouth and anus

Question 7

what do female Ascaris lumbriocoides have

Answer 7

paired uteri

Question 8

what do male Ascaris lumbriocoides have

Answer 8

curved posterior with two chitinous spicules projecting from their anal region

Question 9

what are the male Ascaris lumbriocoides used for

Answer 9

used to hold the female down during copulation

Question 10

how does Ascaris lumbriocoides infect humans

Answer 10

by humans drinking contaminated water or eating contaminated vegetables

Question 11

where does Ascaris lumbriocoides lay their eggs

Answer 11

in soil

Question 12

annelida characteristics

Answer 12

segmented bodies
metamerism
coelomates
con be free living or external parasites

Question 13

segmented bodies of annelids

Answer 13

each segment has its own muscle attachments so that the creature can move each segment independently

Question 14

somite

Answer 14

each of a number of body segments containing the same internal structures, clearly visible in invertebrates

Question 15

metamerism

Answer 15

repetition in body parts

Question 16

can somites be identical both externally and internally

Answer 16

yes

Question 17

coelmates

Answer 17

internal body cavity is lined with mesoderm

Question 18

Class Polychaeta characteristics

Answer 18

bristleworms
have parapodia
caudal somite with cirri
aquatic- most are marine
have anterior tentacles
have eyes
dioceious

Question 19

parapodia

Answer 19

appendages used for swimming

Question 20

cirri

Answer 20

feelers

Question 21

are crayfish worms polychaetes

Answer 21

yes

Question 22

Family Hirundinidae characteristics

Answer 22

leeches
have oral sucker
ectoparasites
loss of defined somites

Question 23

what are the lines called on leeches

Answer 23

annuli which are not true segments

Question 24

why is it beneficial that leeches do not have segemtns

Answer 24

so they can expand when they become engorged with blood

Question 25

Class Oligochaeta characteristics

Answer 25

earthworms body somites lack appendages most are detritovores monoecious

Question 26

detritivores

Answer 26

eat decayin

Question 27

is detritivores the same as decomposers

Answer 27

no