BIO004 - Module 7

Question 1

Phylum PORIFERA Level of Complexity

Answer 1

Cellular level

Question 2

made of many cells that perform different functions, but not
organized enough to form tissues

Answer 2

Cellular level

Question 3

No germ layers despite being metazoan

Answer 3

Phylum PORIFERA

Question 4

Have free-swimming embryos, but the adults are sessile (attaches on the sea floor)

Answer 4

Phylum PORIFERA

Question 5

Commensals to aquatic animals (providing shelter and food)

Answer 5

Phylum PORIFERA

Question 6

means that they have a division of labor to perform specific functions

Answer 6

specialization

Question 7

different types of cells present in a sponge body

Answer 7

-Choanocyte
-Amoebocyte/Archeocytes
-Sclerocytes
-Spongocytes/Collencyte
-Pinacocytes

Question 8

“collar cells” because they have a collar of microvilli surrounding a flagellum

Answer 8

choanocyte

Question 9

The beating of their flagella draws water in like a filter, bringing in oxygen and trapping food
particles between the microvilli

Answer 9

choanocyte

Question 10

Receive the food particles captured by the
choanocytes and digest them through
phagocytosis

Answer 10

Amoebocyte/Archeocytes

Question 11

Cells that secrete a support structure called
spicules (made of calcium carbonate or silicone)

Answer 11

Sclerocyte

Question 12

Cells that secrete a fibrous support structure
called spongin (made of collagen fibers)

Answer 12

Spongocytes/Collencyte

Question 13

Flat cells that almost forms a true tissue; they are
the cells that forms an outer layer to cover the
sponge (called pinacoderm)

Answer 13

Pinacocytes

Question 14

pores of the sponges

Answer 14

dermal ostea

Question 15

3 main designs of canal systems in poriferans

Answer 15

-Asconoid System
-Syconoid System
-Leuconoid System

Question 16

Choanocytes lie in the walls of a large chamber

Answer 16

Asconoid System

Question 17

-The simplest organization; the sponge is small and tube shaped
-Found only in Class Calcerae

Answer 17

Asconoid System

Question 18

Choanocytes lie inside canals

Answer 18

-Syconoid System

Question 19

-Externally, they look like asconoids,
but with thicker walls
-Found mostly in Class Calcarae,
and some in Class Hexactinellida

Answer 19

Syconoid System

Question 20

Choanocytes lie in distinct tiny
chambers

Answer 20

Leuconoid System

Question 21

-The most complex; the tiny
chambers allow sponge to pump
lots of water
-The design allows the sponge to
grow in large sizes
-Mostly found in Class
Demospongiae

Answer 21

Leuconoid System