Lecture 4 - Phyla Cnidaria and Ctenophora

Question 1

What is the largest traditional class of Cnidaria?

Answer 1

Anthoza

Question 2

What is the most variable traditional class of Cnidaria?

Answer 2

Hydrozoa

Question 3

What is the “stinging organelle” present in Cnidocytes known as?

Answer 3

Nematocytes

Question 4

What are the 2 types of Cnidarian body shapes?

Answer 4

1. Polyps
2. Medusae

Question 5

What is the traditional class of jellies known as “true jellies”?

Answer 5

Scyphozoa

Question 6

Marine animals characterized by specialized cells which contain stinging structures.

Answer 6

Cnidarians

Question 7

What are Nematocytes?

Answer 7

stinging organelles present in Cnidaria

Question 8

Marine animals known as comb jellies, with rows of cilia used for swimming

Answer 8

Ctenophores

Question 9

Organisms with two primary layers of cells - ectoderm and endoderm

Answer 9

Diploblastic

Question 10

Organisms with three primary cell layers - ectoderm, mesoderm, and endoderm

Answer 10

Triploblastic

Question 11

What is the difference between the two life forms of Cnidaria ; Polyps and Medusae?

Answer 11

Polyps are immobile (or sessile), cylindrical, and attached to a surface
and Medusae are free-swimming, and umbrella shaped.

Question 12

Radial Symmetry entails what?

Answer 12

parts radiate from a central axis

Question 13

Biradial Symmetry entails what?

Answer 13

combination of bilateral (regular) symmetry and radial symmetry

Question 14

Which of the Cnidarian life forms is umbrella shaped?

Answer 14

Medusae

Question 15

Which of the Cnidarian life forms is Cylindrical?

Answer 15

Polyps

Question 16

True or False: The general life cycle of Cnidaria includes both sexual and asexual reproduction?

Answer 16

True

Question 17

What is meant by Dioecious?

Answer 17

having the male and female reproductive organs in separate individuals

Question 18

What are the 2 newer classes of Cnidaria?

Answer 18

Staurozoa and Myxozoa

Question 18

Which of the traditional classes of Cnidaria, includes variable life forms, some of which being marine?

Answer 18

Hydrozoa

Question 19

What is a typical example of a Hydrozoa Cnidaria?

Answer 19

Colonial Obelia

Question 20

In Colonial Obelia, Hydrorhiza is characterized as what?

Answer 20

a root-like structure for attachment/anchoring

Question 21

In Colonial Obelia, Zooids are characterized as what?

Answer 21

specialized individuals ; either hydranths - feeding zooids
or gonangium - reproductive zooids

Question 22

What are the stem-like parts of Colonial Obelia that extend from the Hydrorhiza?

Answer 22

Hydrocaulus / Hydrocauli

Question 23

What is the living tissue within the Hydrocaulus?

Answer 23

Coenosarc

Question 24

What is the non-living outer covering that surrounds the Hydrocaulus?

Answer 24

Perisac