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Exam (elaborations)

WSU BIOLOGY 106 EXAM 3

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WSU BIOLOGY 106 EXAM 3

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  • September 26, 2024
  • 14
  • 2024/2025
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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

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