Test 3-Nematoda or Aschelminthes

Question 1

asc-

Answer 1

bag/sac

Question 2

helminthes

Answer 2

worm

Question 3

Nearest relatives

Answer 3

other worm groups, flatworms and segmented worms

Question 4

Relative Complexity

Answer 4

relatively simple, although some systems starting to develop

Question 5

Lymph fluid

Answer 5

liquid that surrounds cells

Question 6

Elephantitis

Answer 6

fluid is stuck and ankles swell up

Question 7

Importance to humans

Answer 7

roundworms, human intestines, contaminated soil, vegetation
hookworms, soil (burrow in skin-outside barefoot)
Trichinella, trichinosis, infected pork
pinworms (seat worms) bite kids on butts
filarial worms, elephantitis, river blindness
heartworms in dogs (heart problems) spread by mosquitos
free-living nematodes are decomposers in soil

Question 8

Life Cycle

Answer 8

sexual reproduction

females are often larger than males

Question 9

Common representatives

Answer 9

roundworm, horsehair worms, hookworms

Question 10

Environment or habitat

Answer 10

live everywhere, including soil
free-living, parasites (animal or plant), predators
decomposers, herbivores

Question 11

Length

Answer 11

.2-8 cm

Question 12

Muscles

Answer 12

run in one direction, length of worm (that’s why they thrash)

Question 13

Shape

Answer 13

smooth and round

NOT segmented

Question 14

Protection

Answer 14

cuticle around body

Question 15

Systems

Answer 15

simple: nervous, muscles primitive excretory system, digestive system (2 openings) that have tubular body with mouth, pharynx, intestine, anus

Question 16

Nemat

Answer 16

thread