12B-Sponges & Cnidarians

Question 1

What does sessile mean?

Answer 1

Unable to move from place to place

Question 2

What and how do sponges eat?

Answer 2

They are filter feeders (they filter water in to obtain food). They eat bacteria and algae.

Question 3

How is water moved through the sponge’s central cavity?

Answer 3

The flagella moves the water through the cavity.

Question 4

What kind of skeleton does a jellyfish have?

Answer 4

Hydrostatic

Question 5

True or false: all cnidarians are are sessile?

Answer 5

False

Question 6

Cnidarians have radial symmetry. What does that mean?

Answer 6

They can be divided into equal halves by any plane along the length of the organism

Question 7

Where do jellyfish digest their prey?

Answer 7

Gastrovascular cavity

Question 8

An adult jellyfish is an example of of which cnidarian body form?

Answer 8

Medusa

Question 9

Special cells of cnidarians release painful stingers called _____________ for defense and for capturing prey

Answer 9

Nematocysts

Question 10

List 3 cnidarians other than jellyfish

Answer 10

Hydras, coral, and sea anemones

Question 11

Since adult sponges are sessile, how can they colonize other areas?

Answer 11

Embryonic sponges can swim around briefly and sponges can reproduce sexually and asexually.

Question 12

What animals are in the phylum named Porifera?

Answer 12

Sponges

Question 13

What phylum do jellyfish belong to?

Answer 13

Cnidaria