Lesson 9: King Animalia Invertebrates

Question 1

Phylum porifera p1

Answer 1

-includes sea sponges
-adults are sessile
-obtain food through filter feeding
-obtain oxygen for through diffusion, as they are only a few cells thick
-removes wastes through diffusion
-no need for internal transport system
-they have no nervous system or sensory cells, however, pressure will cause a contractile response

Question 2

Phylum porifera p2

Answer 2

-have a sessile stage(polyp) and a motile stage (medusa)
-aquatic organisms
-radial symmetry
-have specialized cells called nematocysts that release a poison dart to stun their prey

Question 3

Phylum porifera p3

Answer 3

-digest in gastrovascular cavity
-obtain oxygen through diffusion
-expel waste through diffusion (they are only a few cells thick)
-do not need a transport system
-acoelomate
-have no “centralized brain” but do have a nerve net and specialized cells that detect chemicals from food and the touch of foreign objects
-fertilization is external

Question 4

phylum platyhelminthes p1

Answer 4

-flatworms
-flat, ribbon-like body
-live in water, soil or inside other organisms as parasites
-unsegmented
-bilateral symmetry
-acoelomate
…

Question 5

phylum platyhelminthes p2

Answer 5

Class turbellaria
ex. planarians

class trematoda
Ex. Fluke worms

class cestoda
Ex. Tapeworms

Question 6

Phylum nematoda

Answer 6

-roundworms
-live in water, soil and inside other organisms as parasites
-bilateral symmetry
-coelomate
-distinct head and body organs
-digestion is extracellular
-fertilization is internal( some species are hermaphrodites

ex. Hookworm, pinworm, …

Question 7

Phylum annelida (water worms(??))

Answer 7

-segmented worms
-lives in water or underground
-body displays symmetry and three germ layers
-have a coelom and distinct organ systems (nervous and digestive systems)
-digestion is extracellular
-reproduction is sexual
-fertilization is internal (some species are hermaphrodites)

Question 8

Phylum annelida- classes

Answer 8

Class oligochaeta
Ex. Earthworms

class polychaeta
ex. bristle worms

class hyrudinea
ex. leeches

Question 9

phylum mollusca

Answer 9

-soft bodies
-hard shells
-live on land/water
-bilateral symmetry
-coelomate
-digestion is extracellular
-reproduction is sexual
-have a circulatory system and a complex nervous system
-important food source for humans

Question 10

phylum mollusca- classes

Answer 10

Class Gastropoda
•May have one shell
•stomach footed- move on stomach
Ex. snails and slugs

Class Bivalvia
• Two shells hinged together
Ex. clams, oysters, scallops and mussels

Class Cephalopoda
• Have an internal mantel
Ex. squids and octopuses

Question 11

Phylum athropoda

Answer 11

• Aquatic and terrestrial —> largest group of organisms on Earth
• Have an exoskeleton and
well-developed nervous system.
•Bilateral Symmetry
• Coelomate
• Reproduce sexually
• Digestion is extracellular
• Fertilization is internal
• 3 subphyla —> all have exoskeleton

Question 12

Subphylum Crustacea

Answer 12

• 5 classes
• Include lobsters, crabs, shrimp, barnacles and isopods
• 2 antennae
• Aquatic species have gills

Question 13

Subphylum hexapoda

Answer 13

• 4 classes
• Class Insecta:
• Antennae on head
• 3 pairs of legs
• 3 body segments- head, thorax,
abdomen
• Grasshoppers, ants, butterflies, bees

Question 14

Subphylum myriapoda

Answer 14

• 4 classes
• Class Diplopoda:
• Millipedes
• Segmented
• 2 pairs of legs per segment
• Primarily herbivores and
decomposers

Question 15

Subphylum myriapoda

Answer 15

•class chilpoda:
•centipedes
•usually terrestrial carnivores
•1 pair antennae

Question 16

Phylum echinodermata

Answer 16

-aquatic
-radial symmetry
-coelomate
-distinct organ system
-digestion is extracellular
-fertilization is external

Question 17

Phylum echinodermata- classes

Answer 17

•Class Asteroidea
Ex. Sea stars

• Class Holotheroidea
Ex. Sea cucumber

• Class Echinoidea
Ex. Sea urchins and sand dollars