Ctenophora

Question 1

What is the literal meaning of ctenophora

Answer 1

Comb bearing

Question 2

What are the common names for ctenophores ?

Answer 2

sea walnuts and comb jellies

Question 3

What are there habitats ?

Answer 3

Marine. Found in poles to shallow waters.

Question 4

Name the two classes of the phylum Ctenophora

Answer 4

Tentaculata & Nuda

(Ctenphores usually Transparent and fragile)

Question 5

What is the symmetrical characteristics of ctenophora

Answer 5

Biradial or radial symmetry.

Question 6

What germ layer do ctenophora have?

Answer 6

Diploblastic (they have two)

(They have a gelatin matrix like cnidaria; mesoglea)

Question 7

They have a central cavity.

(T/ F)

Answer 7

T

Question 8

What does the central cavity do?

Answer 8

The central cavity communicates with the exterior by the mouth and several anal pores.

Question 9

Do they have organs?

Answer 9

They do not have distinct organs.

Question 10

Where to ctenophora true musclar cells develop in?

(gelatin layer)

Answer 10

Mesoglea

Question 11

What do muscle fibers make?

(what squidward had).

Answer 11

Tentacles.

Question 12

Nervouc system have naked nerve cells/ True or False?

(Think transparency)

Answer 12

True

Question 13

Describe their tentacles?

(housed in? how many? associated with mouth or no?)

Answer 13

Covered in sheath.
Not associated with mouth like cnidarians.
Typically have only two.

Question 14

How many comb plates (aboral rows) do ctenophores have?

(think about squidward he’s an octopus so have how many? )

Answer 14

8 abordal rows

Question 15

Where are the cilia fused to in ctenophora

Answer 15

Aboral Plates (comb plates)

(there are 8 plates)

Question 16

What is the cilia called in ctenophora

Answer 16

Ctenes

Question 17

Ctenes extend transversely from oral to aboral ends

(true or false)

Answer 17

true

Question 18

What direction to the ctenes beat?

Answer 18

From aboral end to oral end

Question 19

What direction is the movement?

Answer 19

Mouth first

Question 20

WHAT DIRECTION IS THE powerstroke

Answer 20

Towards the aboral end.

Question 21

What structures or features coordinate movement of the ctenophora

Answer 21

Nerve net and apical sense organ.

(statocyst)

Question 22

The apical sense organ and the nerve net makes up the ?

Answer 22

Statocyst

Question 23

What is colloblast?

Answer 23

Adhesive cells that capture prey. have adhesive material

Question 24

what allows tentacles to contract?

Answer 24

coNTRACTILE FIBRES.

Question 25

whAT IS THE FUNCTION OF TENTACLES IN THE CTENOPHORA?

Answer 25

They produces sticky threads when prey come into contact with their colloblast.

Question 26

How does the prey go into the mouth of the ctenophora ?

Answer 26

The tentacles wipe the prey along the mouth of the ctenophora for ingestion to begin.

Question 27

What does the mouth of the ctenophora lead to ?

Answer 27

Gastrovascular canal

Question 28

How is the waste of the ctenophora eliminated?

Answer 28

Through the gastrovascular canal but primarily through the mouth of the ctenophora.

Question 29

There are 3 ways in which ctenophores capture prey.

Answer 29

1. Using tentacles colloblast which then swips prey to the mouth there ingestion occures 2. Short tentacles? No problem. Ciliated body allows for collecting prey. 3. Lack tentacles? Feed on their own kind (ctenophores) or medusa. 4. Some actually feed on cnidaria and take their cnidocytes then encorporates it in their epithelial tissues which is used as defense.

Question 30

What is the defense of the ctenophores ?

Answer 30

Some actually feed on cnidaria and take their cnidocytes then encorporates it in their epithelial tissues which is used as defense.

Question 31

Describe the life cycle of ctenophores.

Answer 31

* Holoplanktonic * Hermaphrodite * Reproduce at a young age (invasive at times).

Question 32

Order: Beroida. Describe shape.

Answer 32

can be flat, cylindrical. Long animals.

Question 33

Class: Lobata. Describe morphology.

Answer 33

Have extended lobes that are used to capture prey on their surface. They have short tentacles.

Question 34

Class: Cydrippida. Describe morphology.

Answer 34

Oblong or round. Same as Pleurobrancia.

Question 35

Class: Pleurobrancia. Describe morphology.

Answer 35

Round or oblong. Same as cydrippida.

Question 36

Example of a ctenophora?

Answer 36

Comb jelly and Venus Girdle

Question 37

What causes light cattering?

Answer 37

The beating of the eight rows of locomatory cilia.