Worksheet for Kingdom Animalia: Porifera, Cnidaria, Platyhelminthes
Name_____________________________________________________ Date_______________________
Vocabulary: Match the term to the correct definition
____1 osculum
a) animals that lack a backbone
____2. polyp
b) hard particle made up of calcium carbonate or silicone
and makes up some sponge skeletons
____3. spicule
c) water exits through this opening at the top of sponges
____4. planula
d) flagellated cells
____5. acoelomate
e) is an asexual stage, vase-shaped
____6. medusa
f) sexual stage, bell- shaped
____7. monoecious
____8. tripoblastic
g) typical larva of a cnidarian
h) organism without a body cavity
i) organisms having all three tissue layers
____9. invertebrate
j) having both sexes in the same individual
____10. choanocyte
True or False: Label each statement as true or false. Correct any statement that is false.
_____11. Choanocytes pump water into the interior of the sponge, digest food, and pass nutrients to
amoebocytes.
_____12. A sponge skeleton could be made up of both spongin and spicules or only spongin or
spicules.
_____13. Spongin are hard particles of silicon dioxide or calcium carbonate.
_____14. Cnidocytes are specialized cells whose function is for defense and capturing prey.
_____15. Sponges are more complex than cnidarians because they have tissues and organs.
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
Draw and label parts of a cnidarian (epidermis, mesoglea, gastrovascular cavity, tentacle,
mouth, and Planaria: eyespots, gastrovacular cavity, pharynx, mouth)
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