WSU BIOLOGY 106 EXAM 3 ACTUAL EXAM 2 LATEST VERSIONS
(VERSION A & B) ACTUAL EXAM
Arthropods - ANSWER: Phyla with greatest amount of diversity with 85% of animal
spp
700 million years ago - ANSWER: When the first animals originated
Porifera (sponges) - ANSWER: Phyla with no tissues, muscles, nerves, or specialized
organs
Choanocytes - ANSWER: Flow of water and food acquisition in sponges
Amoebocytes - ANSWER: Found in sponges, these cells are mobile and perform
numerous functions, including reproduction, transport of food particles to
nonfeeding cells, and secretion of material that forms the spicules
Spicules - ANSWER: Found in sponges, these consist of inorganic materials and
support the animal
Cnidaria (jellyfish) - ANSWER: Phyla with 2 tissue layers, contractile muscle and nerve
cells, gastrovascular cavity, and radial symmetry
Metazoa - ANSWER: multicellular animals
Cambrian Explosion - ANSWER: Diversity of large animals increased dramatically
around 550 million years ago
Three tissue layers - ANSWER: ectoderm, mesoderm, endoderm
Bilateral symmetry - ANSWER: Posterior/anterior
left/right senses concentrated in head and direction of movement
Coelom - ANSWER: Body cavity with space to put organs
Lophotrochozoa - ANSWER: A phyla group that has feeding and locomotory
similarities
Ectoprocta - ANSWER: Colonial, filter feeders
All cells are identical
Cannot move
Rotifera - ANSWER: eutely and small phylum (< 3mm)
Filter feeders
Have set number of cells
, Cryptobiosis - ANSWER: To hide life
What occurs when environment changes around rotifera
How rotifera develop - ANSWER: Individual cells enlarge rather than divide
Annelida - ANSWER: Segmented worms
Hydrostatic skeleton
Hydrostatic skeleton - ANSWER: skeleton made of fluid-filled body segments that
work with muscles to allow the animal to move
Metanephridia - ANSWER: Tubes that process metabolic waste in annelidas
Mollusca - ANSWER: Visceral mass, mantle, and foot
Contain radula
Radula - ANSWER: An organ covered with teeth that mollusks use to scrape food into
their mouths
Nudibranchs - ANSWER: Sea slugs
Bivalves - ANSWER: mollusks that have two shells held together by hinges and strong
muscles (clams)
Cephalopods - ANSWER: octopus, squid
Platyhelminthes - ANSWER: Phylum of flatworms
80% are parasitic
Ecdysozoa - ANSWER: Nematoda and Arthropoda
Nematodes - ANSWER: Roundworms
cuticle, molt, eutetly, ubiquitous, a few spp parasitic
Abundant in soil and aquatic habitats
Pinworms - ANSWER: Parasite of the gut
Common in young children
Hookworm - ANSWER: Parasitic worm that consumes blood
filarial roundworms - ANSWER: Parasitic worm that causes elephantiasis or
destruction of lymphatic system
Arthropoda - ANSWER: Phylum where all species have a segmented exoskeleton and
jointed appendages
(VERSION A & B) ACTUAL EXAM
Arthropods - ANSWER: Phyla with greatest amount of diversity with 85% of animal
spp
700 million years ago - ANSWER: When the first animals originated
Porifera (sponges) - ANSWER: Phyla with no tissues, muscles, nerves, or specialized
organs
Choanocytes - ANSWER: Flow of water and food acquisition in sponges
Amoebocytes - ANSWER: Found in sponges, these cells are mobile and perform
numerous functions, including reproduction, transport of food particles to
nonfeeding cells, and secretion of material that forms the spicules
Spicules - ANSWER: Found in sponges, these consist of inorganic materials and
support the animal
Cnidaria (jellyfish) - ANSWER: Phyla with 2 tissue layers, contractile muscle and nerve
cells, gastrovascular cavity, and radial symmetry
Metazoa - ANSWER: multicellular animals
Cambrian Explosion - ANSWER: Diversity of large animals increased dramatically
around 550 million years ago
Three tissue layers - ANSWER: ectoderm, mesoderm, endoderm
Bilateral symmetry - ANSWER: Posterior/anterior
left/right senses concentrated in head and direction of movement
Coelom - ANSWER: Body cavity with space to put organs
Lophotrochozoa - ANSWER: A phyla group that has feeding and locomotory
similarities
Ectoprocta - ANSWER: Colonial, filter feeders
All cells are identical
Cannot move
Rotifera - ANSWER: eutely and small phylum (< 3mm)
Filter feeders
Have set number of cells
, Cryptobiosis - ANSWER: To hide life
What occurs when environment changes around rotifera
How rotifera develop - ANSWER: Individual cells enlarge rather than divide
Annelida - ANSWER: Segmented worms
Hydrostatic skeleton
Hydrostatic skeleton - ANSWER: skeleton made of fluid-filled body segments that
work with muscles to allow the animal to move
Metanephridia - ANSWER: Tubes that process metabolic waste in annelidas
Mollusca - ANSWER: Visceral mass, mantle, and foot
Contain radula
Radula - ANSWER: An organ covered with teeth that mollusks use to scrape food into
their mouths
Nudibranchs - ANSWER: Sea slugs
Bivalves - ANSWER: mollusks that have two shells held together by hinges and strong
muscles (clams)
Cephalopods - ANSWER: octopus, squid
Platyhelminthes - ANSWER: Phylum of flatworms
80% are parasitic
Ecdysozoa - ANSWER: Nematoda and Arthropoda
Nematodes - ANSWER: Roundworms
cuticle, molt, eutetly, ubiquitous, a few spp parasitic
Abundant in soil and aquatic habitats
Pinworms - ANSWER: Parasite of the gut
Common in young children
Hookworm - ANSWER: Parasitic worm that consumes blood
filarial roundworms - ANSWER: Parasitic worm that causes elephantiasis or
destruction of lymphatic system
Arthropoda - ANSWER: Phylum where all species have a segmented exoskeleton and
jointed appendages
