Chapter 13: Exam Prep

Question 1

The traditional view of cnidarians relative to germ layers is that Cnidaria possesses

Answer 1

two germ layers, ectoderm and endoderm

Question 2

Nematocysts are

Answer 2

formed and used only by Cnidaria although a few other organisms may “steal” them.

Question 3

The ____ stage is best adapted for cnidarians living in colonies while the ____ stage helps in dispersal and survival in open oceans.

Answer 3

polyp, medusa

Question 4

The class Hydrozoa contains Hydra, Obelia, and

Answer 4

the Portuguese man-of-war

Question 5

The class of radiate animals with the largest, most conspicuous medusa stage is

Answer 5

scyphozoa

Question 6

The correct sequence in the life cycle of the jellyfish Aurelia is

Answer 6

planula, scyphistoma, and ephyra

Question 7

Which of the following is a characteristic of stauromedusans?

Answer 7

They have a solitary polyp body

Question 8

A pharynx and mesenteries are structures found in

Answer 8

sea anemones

Question 9

To help overcome prey, some sea anemones have _____ with nematocysts and gland cells that protrude through the mouth or pores.

Answer 9

acontia threads

Question 10

Hermaphroditic sea anemones that produce sperm first and eggs later, to prevent self-fertilization, are called

Answer 10

protandrous

Question 11

Sea anemones lack

Answer 11

A Medusa stage

Question 12

Which statement about Cnidaria is NOT ture?

Answer 12

Have 3 germ layers: ectoderm, mesoderm, and endoderm

Question 13

Her stupid corals have mutualistic algal cells in their tissues called

Answer 13

zooxanthellae

Question 14

Ctenophores used specialized “glue” cells called _____ to catch small animals for food

Answer 14

colloblasts

Question 15

If you removed the statocyst from a ctenophore, the most likely symptom you would notice would be

Answer 15

disorientation or swimming in a haphazard manner

Question 16

Nematocysts are stinging organelles contained inside cells called _____

Answer 16

Cnidocytes

Question 17

Water in the gastrovascular cavity serves as a ____ skeleton

Answer 17

Hydrostatic

Question 18

The small organs of equilibrium in scyphozoan jellyfishes are called_____, and these are borne in more complex sense organs called rhopalium

Answer 18

Statocysts

Question 19

A distinguishing characteristic of cubozoan medusae is the presence of flattened blades called____ at the base of the tentacles

Answer 19

Pedalia

Question 20

Ctenophores are propelled by eight plates bearing, long, fused____

Answer 20

Cilia