ch. 33 triploblastic pseudocoelomates

Question 1

phylum of triploblastic pseudocoelomates

Answer 1

• phylum Rotifera
• phylum nematoda

Question 2

characteristics of phylum Rotifera

Answer 2

• inhabit freshwater, marine, and damp soil habitats
• tiny animals - smaller than many protists
• multicellular with specialized organ systems
• complete digestive tract - alimentary canal
• parthenogenesis

Question 3

alimentary canala

Answer 3

complete digestive tube with a separate mouth and anus that lies within a fluid-filled psedocoelom

Question 4

parthenogenesis

Answer 4

unfertilized diploid eggs develop into females
(which means unfertilized haploid eggs develop in males that live long enough to produce sperm)

Question 5

does phylum Rotifera have males?

Answer 5

no - die off quickly

Question 6

phylum Nematoda characteristics

Answer 6

• aquatic habitats, soil, tissues of plants/animals
• lack circulatory system
• alimentary canal
• longitudinal body wall muscles
• contraction produces thrashing motion

Question 7

nematodes =

Answer 7

roundworms

Question 8

are nematodes parasites or free-living?

Answer 8

both

Question 9

Trichinella spiralis

Answer 9

parasite that can be acquired by humans from undercooked pork
- Nematode

Question 10

Caenorhabditis elegans

Answer 10

model organism of nematode

Question 11

Ascaris lumbricoides

Answer 11

over 1 billion people infected - nematode

Question 12

nectar Americanus

Answer 12

hookworm - nematode

Question 13

enterobius vermicularis

Answer 13

pinworm - nematode

Question 14

wuchereria bancrofti

Answer 14

causes elaphantiasis - nematode

Question 15

Ascaris

Answer 15

parasitic round worms of humans - nematode