Chapter 33 -1

Question 1

Sponges are in what phylum?

Answer 1

porifera

Question 2

What are the characteristics of porifera?

Answer 2

7000 marine species
sessile adults
swimming larvae

Question 3

What are the 3 layers of the sponge/porifera?

Answer 3

outer epidermis
mesohyle
spongocoel

Question 4

What happens in the outer epidermis?

Answer 4

water enters via incurrent ostia & exits through the osculum

Question 5

What happens in the mesohyle?

Answer 5

middle gelatinous matrix containing amebocytes, spicules, and spongin

Question 6

What happens in spongocoel?

Answer 6

inner layer lined with flagellated chaonocytes (collar cells) that circulate water

Question 7

What are the 2 types of cells of porifera/sponges?

Answer 7

collar cells

amoebocytes

Question 8

What are collar cells?

Answer 8

flagellated chaonocytes with feeding collars that circulate water

Question 9

What are amoebocytes?

Answer 9

cells that move with pseudopods, clean pores, and secrete spicules & spongin