Chapter 32

Question 1

What are the 6 phylum in the invertebrate part of the animalia kingdom?

Answer 1

1. Porifera
2. Cnidaria
3. Platyhelminthes
4. Nematoda
5. Annelida
6. Mollusca

Question 2

What are the characteristics of the phylum Porifera? What is an example of it?

Answer 2

Simplest multicellular animals
Asymmetrical
Use spicules as support
No organs, can be dissociated and re form
Sexes aren't separate (hermaphroditic)
Example: sponge

Question 3

What are the characteristics of the phylum Cnidaria or Coelenterata? What are two examples of it?

Answer 3

Two General body forms, polyp (upside down jelly fish) and medusa (jellyfish)
All carnivorous
Single opening (mouth and anus)
Tentacles to pull food in

Examples: jellyfish, hydra, coral

Question 4

What are the characteristics of the phylum Platyhelminthes? What are examples of this?

Answer 4

Simplest animals showing bilateral chemistry
Head and tail regions
Plat- flat worms

Examples: planaria, tapeworm, fluke

Question 5

What are the three classes in the Platyhelminthes phylum?

Answer 5

Turbellaria- planaria
Trematoda- fluke
Cestoda- tapeworm

Question 6

What are the characteristics of the phylum Nematoda? What are some examples of this?

Answer 6

Small size
Two openings mouth and anus
Estimated 100 000 species
Aqua and land

Examples: pinworms, roundworms

Question 7

What are the characteristics of the phylum Annelida? What are some examples of it?

Answer 7

Body divided into separate sections (segments)
Tube within a tube body plan

Examples: earthworm and leech

Question 8

What are the three classes within the Annelida phylum?

Answer 8

Oligochaeta - earthworms
Hirudinea- leeches
Polychaeta - sandworms

Question 9

What are the characteristics of the phylum Mollusca? What are examples of this?

Answer 9

Second largest animal phylum
Aqua and land
Separate sexes (hermaphroditic)

Examples: clam and snail

Question 10

What are the three classes in the phylum mollusca?

Answer 10

Gastropoda - snails, slugs
Bivalvia - oysters, clams
Cephalopoda - octopus, squid

Question 11

What is a mesoglea?

Answer 11

Middle layer in the jelly fish body wall

Question 12

What is the coelom?

Answer 12

Fluid filled Body space or cavity between two tubes

Question 13

What is the gastrovascular cavity?

Answer 13

Internal body cavity of jellyfish

Question 14

What does hermaphroditic mean?

Answer 14

Presence of both sexes in the same individual

Question 15

What is cephalization?

Answer 15

Development of an anterior end

Question 16

What are proglottids?

Answer 16

Individual segments of tapeworm

Question 17

What are parapodia?

Answer 17

Extensions that aid movement in sandworms

Question 18

What are aortic arches?

Answer 18

Hearts

Question 19

What are cnidoblasts?

Answer 19

Stinging cells

Question 20

What is the difference between radial and bilateral symmetry?

Answer 20

Radial- line down the central of animal where right angle cross sections to the line show repeating structure
Bilateral- cut an organism into to two only once and it will be the same on both sides

Question 21

What are nematocysts?

Answer 21

Small fluid filled capsules containing a coiled thread

Found in cnidoblast

Question 22

What is the pharynx?

Answer 22

A muscular tube that can be extended through the mouth opening for eating in planaria

Question 23

What is the mantle?

Answer 23

A fold of skin that surrounds the bodies organs

Question 24

What is the radula?

Answer 24

A rasping, tongue like organ in mollusks