Topic 10 Phylums and Groupings

Question 1

Ctenophora

Answer 1

Comb jellies or sea walnuts

Radial symmetry, anal pores, no cnidocytes, comb-like plates of fused cilia

Most bioluminescent

Question 2

Porifera

Answer 2

Sponges

Asymmetrical filter feeders made up of a loose confederation of cells

Motile larvae, sessile adults

Spicules - calcium carbonate and silica skeleton

Question 3

Cnidaria

Answer 3

Stinging-celled animals

Distinguishable tissues but no organs, simple nerve net

Carnivorous with cnidocytes, but sessile

Internal digestion

Question 4

3 life cycle stages in Cnidaria

Answer 4

Planula - multicellular with cilia, part of plankton
Polyp - sessile, develops from planula
Medusa - often umbrella-shaped and motile

Question 5

4 classes in Cnidaria

Answer 5

Hydrozoa, Scyphozoa, Cubozoa, Anthozoa

Question 6

Hydrozoa

Answer 6

Hydroids

Marine, colonial organisms

Have both polyp/medusa

Question 7

Scyphozoa

Answer 7

Jellyfish

Dominant medusa, small polyp

Separate sexes, polyps form from multiple medusae

Question 8

Cubozoa

Answer 8

Box jellyfish

Box-shaped medusa, small polyp

Fatal stings to humns

Question 9

Anthozoa

Answer 9

Sea anemones and corals

Largest class in Cnidaria

Dominant polyp, can be solitary/colonial

Often symbiotic with algae

Question 10

Coral exoskeletons are made of _____

Answer 10

calcium carbonate