Characteristics Used To Classify Animal Phyla

Question 0

Germ layer

Answer 0

Tissue or cell layers
•Porifera and cnidarians have 2•
The rest have 3

Question 1

What are the characteristics that are used to classify phyla

Answer 1

Reproduction 
Presence or absence of coelom
Intra/extra cellular digestion 
Skeleton (endo/Exo)
Germ layers
Body symmetry

Question 2

Extracellular vs intracellular

Answer 2

Extracellular-outside individual cells and nutrients are then absorbed ••all other groups••

Intracellular- inside individual cells (no true digestive system) ••Porifera••

Question 3

Digestive systems

Incomplete vs complete

Answer 3

Incomplete(single opening for both food and waste)•Cnidaria and Platyhelminthes•

Complete(food travels in one direction from mouth to anus) “tube within a tube” •all other groups•

Question 4

Body symmetry

Answer 4

Asymmetrical-no symmetry
Radial- centre point splits
Bilateral- directly in half

Question 5

Coelom (advantages and disadvantages)

Answer 5

Fluid filled body cavity

Advantages: adds strength and allows organs to develop into complex molecules

Question 6

Reproduction

Answer 6

Asexual(budding, fragmentation/regeneration)

Sexual (sperm and egg)

Question 7

Exoskeleton vs endoskeleton

Answer 7

Exo- outside skeleton, no internal bones, composed of carbohydrate chitin, protects and supports

Endo- inside skeleton, an internal framework of the body, provides support

Question 8

Most successful phylum?

Answer 8

Arthropods

• over 1 million identified, 10 million unidentified
• exoskeleton(made of chitin);specialized body segments, specialized appendages(legs class wings), well developed nervous systems;specialized mouth parts for obtaining and eating food

Question 9

What is the term for which the species that has both make and female reproductive organs?

Answer 9

Hermaphrodite

Question 10

Vertebrate classes

Answer 10

Porifera (sponges)
Cnidaria (stinging cells)
Platyhelminthes (flatworms)
Nematoda (round worms)
Annelida (segmented worms)
Mollusca  (soft bodied animals)
Echinodermata (spiny skinned)
Arthropoda (insects)
Chordata (animals with a dorsal nerve chord, a notochord, gill slits)