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Chapter 33

Biodiversity Spring 2026- Exam 3

QuestionAnswer
What are key evolutionary traits in animals (in order of appearance)? Tissue, symmetry, coelom, protostome/deuterostome, molting
What are key traits of the porifera (sponges)? No tissue, asymmetrical, filter feeders
What is the feeding method of porifera? Choanocytes filter food
What are key traits of cnidaria? Radial, diploblastic, gastrovascular cavity
What are cnidocytes of cnidaria? Stinging cell with nematocysts
What are the body forms of cnidaria? Polp (sessile), medua (swimming)
What are key traits of the platyhelminthes (flatworms)? Bilteral, acelomate, simple organs
Digestive system of platyhelminthes (flatworms)? Incomplete (single opening)
Main body parts of the mollusca? Foot, mantle, visceral mass
What is a radula of a mollusca? Feeding structure
What is the circulatory system of a mollusca? Mostly open (except cephalopods)
What is the key trait of the annelida? Segmentation
What is the circulatory system of the annelida? Closed circulatory system
Key traits of the nematoda Pseudocoelom, complete digestive tract
Key traits of arthropoda Exoskeleton, molting, jointed appendages
What unique system does the echinodermata have? Water vascular system
How does the echinodermata move? Tube feet
What is the defining trait of the chordata? Notochord
What are the subgroups of cnidaria classes? Hydrozoa, scyphozoa, anthozoa
What are the subgroups of the mollusca classes? Gastropods, bivalves, cephalopods
What are the subgroups of the arthropoda groups? Hexapods, crustaceans, chelicerates
Define choanocyte Sponge feeding cell
Define amoebocyte Transport nutrients in sponds
Define filter feeder Strains food from water
Define gastrovascular cavity Digestion chamber
Define intracellular digestion Inside cells
Define extracellular digestion Outside cells
Define exoskeleton External skeleton
Define endoskeleton Internal skeleton
Define alimentary canal Complete digestive tract
Define open circulatory system Hemolymph bathes organs
Define closed circulatory system Blood in vessels
Define molting Shedding exoskeleton
Define water vascular system Hydraulic movement system
Define tube feet Movement/feeding structures
Define notochord Flexible support rod
Created by: KristenR2025
 

 



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