Diploblasts

Question 1

By definition, all diploblasts have how many germ layers?

Answer 1

2 - ectoderm and endoderm

Question 2

What does the ectoderm form?

Answer 2

outer layer of the organism (skin)

Question 3

What does the endoderm give rise to?

Answer 3

The lining of the digestive tract, organs such as the liver and the lungs of some vertebrates.

Question 4

what subkingdom do all diploblasts belong to?

Answer 4

Subkingdom eumetazoa

Question 5

What phyla are diploblastic?

Answer 5

Cnidaria, and Ctenophora

Question 6

Cnidarians have 3 classes, what are they?

Answer 6

Hydrozoa, Scyphozoa, Cubozoa, and Anthozoa

Question 7

in Cnidaria, what is the mesoglea?

Answer 7

A jelly-like layer between the epidermis and gastrodermis

Question 8

Cnidarians and Ctenophores have what type of symmetry

Answer 8

radial

Question 9

What kind of nervous tissue do cnidarians have

Answer 9

Nerve nets - a non-centralized arrangement of neurons

Question 10

What are the specialized cells found only in cnidaria?

Answer 10

Cnidocytes

Question 11

What are the organelles in cnidocytes after which Cnidaria is named?

Answer 11

Cnidae - tiny capsule-like organelles that explode outward

Question 12

Specialized cnidae

Answer 12

nematocysts - stinging barb

Question 13

What are the sessile and motile forms that cnidaria take on?

hint: some cnidarians alternate between the two stages during development.

Answer 13

medusa are motile

Polyp are sessile

Question 14

in cnidarians, a single opening functions as what?

Answer 14

mouth and anus

Question 15

Cnidarians have what kind of cavity?

Answer 15

gastrvascular cavity

Question 16

Class hydrozozoa contains what 2 unique organisms. what are they?

Answer 16

Obelia (colonial) and Hydras (exist only as polyp)

Question 17

hydras exist only as a ______

Answer 17

polyp

Question 18

Most cnidarians alternate stages, (except hydrazoans) what is the purpose of the medusa stage in those that do?

in obelia what is the function of polyp?

Answer 18

they swim off to reproduce sexually, in obelia the polyp stage reproduces asexually.

Question 19

What are Scyphozoa? Dominant stage?

Answer 19

True Jellies, Medusa stage

Question 20

What are 2 examples of Cubozoans?

Answer 20

Box jellies and sea wasps (one of the deadliest organisms)

Question 21

What are cubozoans primary predators?

Answer 21

Sea turtles

Question 22

Anthozoans include ________ and _________

Answer 22

Corals and Sea anenomes?

Question 23

Why do we have coral reefs?

Answer 23

Each generation of coral builds on the skeleton of the last.

Question 24

some anthozoans have symbiotic relationships with ______ called ________

Answer 24

Algae (zooxanthelae)

Question 25

Phylume Ctenophora are known as ______

Answer 25

Comb jellies because of their 8 comb rows.

Question 26

Ctenophores are unique because they are the _________

Answer 26

largest ciliated organisms

Question 27

Describe the medusa stage.

Answer 27

Motile and free swimming. look like an upside down bell shaped polyp (oriented mouth/anus down)

Question 28

Describe the polyp stage.

Answer 28

sessile organisms that are oriented mouth/anus up. tenticles project upwards as they wait for prey.

Question 29

what is the name for the larva stage of a hydra?

Answer 29

Planula

Question 30

What class of cnidaria have zooxanthelae?

Answer 30

Anthozoa