Chapter 28 Animal Planet: Creatures from the Sea

Which class is also called "flower animals"? a. Anthozoa. b. Cubozoa. c. Hydrozoa. d. Scyphozoa.

a. Anthozoa.

How does a sponge reproduce asexually? a. Budding. b. Gemmules. c. Fragmentation. d. All of the above.

a. Budding.

While exploring, you discover a hydrozoan called Hydra sp. Where did you find the Hydra sp.? a. Pond. b. Ocean. c. Coral reef. d. Brackish water.

a. Pond.

Which of the following statements about sponges is NOT true? a. They produce both eggs and sperm. b. They are filter-feeding invertebrates. c. Their skeletal structure consists of spicules and/or spongin. d. They have mesoglea between the epidermis and endodermis.

a. They produce both eggs and sperm.

A medusa is often described as ____. a. an umbrella-shaped body with tentacles that hang down b. a tube-shaped body with a mouth surrounded by tentacles c. a ball-shaped body with many branches d. a porous vase lined with flagellated cells

a. an umbrella-shaped body with tentacles that hang down

While swimming in the ocean, you feel a sting on your leg from a Portuguese man-of-war. The sting was caused by ________. a. nematocysts b. cnidoblasts c. cnidocysts d. nematoblasts

a. nematocysts

Why would you add bleach to a sponge specimen before observing it through a microscope? a. Bleach will sterilize the sample. b. Bleach will dissolve the spicules, making it easier to see the spongin. c. Bleach will dissolve the spongin, making it easier to see the spicules. d. Bleach will force water out of sponge pores.

b. Bleach will dissolve the spicules, making it easier to see the spongin.

This organism is a member of what phylum? a. Ctenophora. b. Porifera. c. Cnidaria. d. Mollusca.

b. Porifera.

True jellyfishes belong to which class of phylum Cnidaria? a. Hydrozoa. b. Scyphozoa. c. Cubozoa. d. Anthozoa.

b. Scyphozoa.

How does a hermit crab benefit from a relationship with sea anemones? a. Hermit crabs eat anemones. b. Sea anemones provide camouflage for hermit crabs. c. Sea anemones eat fish that prey on hermit crabs. d. Hermit crabs use anemones as insulation from cold ocean waters.

b. Sea anemones provide camouflage for hermit crabs.

. Ctenophores have adhesive cells called ________________ which are used to_________. a. comb plates, swim b. colloblasts, capture food c. nematocysts, capture food d. luminaria, light up the surrounding environment

b. colloblasts, capture food

. Excretion and respiration in sponges occur through _____________. a. osmosis b. diffusion c. division d. digestion

b. diffusion

This member of the Cnidaria has feeding polyps and reproductive polyps. The reproductive polyps produce ________. a. planula larva b. medusa buds c. polyps d. ephyra

b. medusa buds

The word Porifera comes from a Latin word that means ___________. a. porous b. pore-bearer c. pole-flower d. pore-flower

b. pore-bearer

Which jellyfish is most likely to deliver a lethal sting? a. Aurelia sp. b. Chrysaora sp. c. Chironex fleckeri. d. Cassiopeia sp.

c. Chironex fleckeri.

. Diploblastic animals have which germ layers? a. Ectoderm and mesoderm. b. Mesoderm and endoderm. c. Ectoderm and endoderm. d. Mesoderm, ectoderm, and endoderm

c. Ectoderm and endoderm.

Which of the following allows water to enter a sponge? a. Mesohyl. b. Amoebocyte. c. Ostia. d. Osculum.

c. Ostia.

Name this stage in the jellyfish life cycle. a. Young medusa. b. Ephyra. c. Strobila. d. Scyphistoma.

c. Strobila.

What is the purpose of the basal disk in the Hydra? a. To capture food. b. To reproduce asexually. c. To attach to a substrate. d. To protect the stalk.

c. To attach to a substrate.

Which of the following is NOT true for the Cnidarians? a. Exhibit two body forms: polyp and medusa. b. Possess nematocysts. c. Triploblastic. d. Extracellular digestion.

c. Triploblastic.

. Anemones feed primarily on ________________. a. algae b. carbon dioxide and water (photosynthesis) c. fishes d. other anemones

c. fishes

Cnidarians have all of the following EXCEPT ________________. a. ectoderm b. endoderm c. mesoderm d. gastroderm

c. mesoderm

Cnidarians have ______________ between the epidermis and the gastrodermis. a. polyps b. endodermis c. mesoglea d. nematocysts

c. mesoglea

The central cavity of a sponge , the __________________, is lined with _____________. a. gastrovascular cavity, choanocytes b. canal system, choanocytes c. spongocoel, choanocytes d. osculum, choanocytes

c. spongocoel, choanocytes

What happens after a true jellyfish has produced a zygote? a. A polyp grows and buds. b. An asexual strobila is formed. c. A medusa breaks off, then drifts away. d. A ciliated planula larva forms on the medusa.

d. A ciliated planula larva forms on the medusa.

Which of the following statements about cnidarians is NOT true? a. They sting their prey with nematocysts on their tentacles. b. They have two body forms: medusa and polyps. c. They are filter-feeding invertebrates. d. They are radially symmetrical.

d. They are radially symmetrical.

. In a sponge with an asconoid canal system, water is filtered and exits via the ___________. a. spicules b. ostia c. spongocoel d. osculum

d. osculum

A friend tells you he was stung by a "sea gooseberry" in a freshwater pool. Explain why your friend is incorrect. a. Sea gooseberries exist only in marine environments. b. Sea gooseberries do not possess nematocysts. c. Sea gooseberries are nearly invisible. d. All of the above. e. A and B.

e. A and B.

Which of the following cnidarians exist in a polyp form? a. Corals. b. Sea anemones. c. Jellyfish. d. All of the above. e. A and B.

e. A and B.

Which of the following is a characteristic of jellyfish? a. Radial symmetry. b. Bilateral symmetry. c. Incomplete digestive tract. d. B and C. e. A and C.

e. A and C.