Invertebrates 3 Chapter 33

Question 1

Ecdysozoa

Answer 1

Molting animals

Question 2

Phylum:
Nematoda

Answer 2

Roundworms

Question 3

Roundworms are

Answer 3

Unsegmented/ Worms That Molt

Question 4

Roundworms have

Answer 4

Unsegmented/ 25,000 described species/ Have a collagenous cuticle (which they molt)/Decomposers or parasites/?/ No circulatory system /No respiratory system.

Question 5

Nematode characteristics

Answer 5

Worm shaped & tapered/Can suspend
metabolism and enter cryptobiosis/Habitat is Aquatic,Moist soil,Endoparasites (including of humans)

Question 6

More Nematode characteristics

Answer 6

A square meter of ocean bottom sediment can contain up to 4 million nematodes/ One rotting apple core can hold 90,000 nematodes/On 1 acre of farmland there are 100 billion nematodes/ 4 out of every 5 animals on
earth is a nematode

Question 7

Dioecious and sexually dimorphic

Answer 7

Have two morphologically distinct sexes

Question 8

Facts about Tardigrades

Answer 8

Microscopic (0.1 – 1.5 mm), aquatic, segmented
animals with 8 legs/ 800 described species/Enterocoel acts as a hemocoel/Ventral nerve cord/Molt chitinous cuticle/Non-jointed legs/ Respiration by diffusion/ No circulatory system.