Download Worksheet 2.1 - Iowa State University

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Ch. 33: Intro. To Animals
Worksheet 2.1
Supplemental Instruction
Iowa State University
Hannah
BIOL 211 (2)
Dr. Waldman
02/01/16
1.) __________________________ are the closest living relatives to animals.
2.) What are some characteristics of animals?
a. What two characteristics do animals have that sponges lack?
3.) Name and describe the 3 embryonic tissue (germ) layers.
a. What is the difference between a diploblast and a triploblast?
4.) What is a coelom?
a. Differentiate between a coelomate, acoelomate, and a pseudocoelomate.
5.) For the pictures below, state whether the animal demonstrates radial or bilateral
symmetry.
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6.) Bilaterally symmetric animals have a _______________ nervous system while radially
symmetric animals have a ________________ _____________.
7.) How do protostomes and deuterostomes differ in their gastrulation (formation of mouth
or anus) and their formation of a coelom?
8.) Define the 3 modes of embryonic development:
9.) Fill in the missing information in the table below.
Characteristics
Key Lineage
General
Porifera (sponges)
Movement
Benthic
Asymmetrical
Lack nerves and
muscles
No true tissues
Ctenophora (comb
jellies)
Cnidaria (jellyfish,
corals, anemones,
hydroids)
Feeding
Hermaphrodites
Predators
Adhesive
tentacles
Radial
symmetry
Mostly marine
Simple muscles
& nerves
Reproduction
Motile (cilia)
Free swimming
larvae
Hydrostatic
skeleton
Mesoglea
(supports body)