Quiz 6

Question 1

Kingdom Animalia (includes..)

Answer 1

• eukaryotic
• multicellular
• heterotrophic
  Organisms

Question 2

Multicellular

Answer 2

Lack of a cell wall

Question 3

Characteristics that are used to place animals into different phyla include (5)

Answer 3

• type of body symmetry
• segmentation
• level of organization
• number of germ (tissue) layers
• presence / absence of body cavity

Question 4

Phylum Porifera

• animal?
• level of organization
• symmetry
• Acoelomate / Pseudocoelomate / coelomate
• 3 special facts

Answer 4

• sponges
• cellular level of organization (lacking tissues and organs)
• asymmetrical body form
• acoelomate (lack body cavity)
• SIMPLEST organisms in animal kingdom
• filter feeders
• possess choanocytes

Question 5

Choanocytes

In Phylum Porifera

Answer 5

special flagellated cells, which act to circulate water Through the internal cavity (the spongocoel)

• food is digested intracellularly by choanocytes

Question 6

Phylum Cnidaria

• animal? (4)
• symmetry
• ___blastic
• level of organization
• 4 special facts
• Acoelomate / Pseudocoelomate / coelomate??

Answer 6

• jellyfishes, sea jellies, corals, anemones
• radially symmetrical
• diploblastic (2 germ layers)
• tissue level of organization
• digestion begins EXTRACELLULARLY within a GASTROVASCULAR cavity
• the mouth opens into the gastrovascular cavity and serving as the common site for the entrance of food and the exit of waste products
• equipped with nematocytes
• Exhibit a life cycle which involves 2 body forms, a polyp stage and a Medusa stage (alternation of generation)

Question 7

Nematocytes

Phylum Cnideria

Answer 7

• Cells (nematocytes) that contain stinging structures (nematocysts)

• nematocysts are utilized to capture food

Question 8

Phylum Platyhelminthes

• animal?
• symmetry
• ___blastic
• Acoelomate / Pseudocoelomate / coelomate
• level of organization
• 2 special facts

Answer 8

• flatworms, tapeworms, flukes
• bilaterally symmetrical
• triploblastic (3 germ layers)
• acoelomate (lack of body cavity)
• organ level of organization
• Cephalization or an accumulation of sensory structure in a head region is present
  
  • like in cnidarians, the mouth serves as the site for food entry and waste exit

Question 9

Acoelomate

Answer 9

• lack of body cavity

• 3 layered, no coelom
• flatworms, ribbon worms

Question 10

Pseudocoelomate

Answer 10

• possess a body cavity not implement lined by mesoderm

• 3 layered, Pseudocoelom
• nematodes, etc

Question 11

Coelomate

Answer 11

• true body cavity

• 3 layered, coelom
• mollusks, anne lids, arthopods, chordates, etc

Question 12

Phylum Nematoda

• animal?
• ___blastic
• Acoelomate / Pseudocoelomate / coelomate
• level of organization
• 1 special fact

Answer 12

• roundworms
• triploblastic
• pseudocoelomate (possess a body cavity not implement lined by mesoderm)
• organ system level of organization
• complete gut with on opening (mouth) serving as the site for the entrance of food and a separate opening (anus) as the site of waste removal

Question 13

Phylum Mollusca

• animal (6)
• symmetry
• ___blastic
• Acoelomate / Pseudocoelomate / coelomate
• level of organization
• 2 special facts

Answer 13

• snails, slugs, clams, oysters, squids, octopuses
• bilaterally symmetrical
• triploblastic
• coelom (true body cavity)
• organ system level of organization
• symmetry undergoes modifications during the development of some gastropods.
• basic body: head, mantel, foot
  (These regions may be highly modified I. Some mollusks)

Question 14

Phylum Annelida

• animal?
• symmetry
• ___blastic
• Acoelomate / Pseudocoelomate / coelomate
• segmentation?
• level of organization

Answer 14

• AKA: segmented worms
• earthworms, clam worms, leeches
• bilaterally symmetrical
• triploblastic
• coelomate
• segmentation
• organ system level of organization