Phylum Porifera

Question 1

Habitat

Answer 1

Most marine and brackish
Some freshwater

Question 2

Tissues

Answer 2

Not embryonic, so no true tissues
Specialized cells

Question 3

Symmetry

Answer 3

Asymmetric

Question 4

Mobility

Answer 4

Mobile larve
Sessile adults

Question 5

Organs

Answer 5

No organ system
2 cell layers cover Skelton
Amoebiod

Question 6

Skeleton composition

Answer 6

Silica
Calcium carbonate
Protein spongin

Question 7

Nutrition

Answer 7

Filter feeders (choanocytes)
Intracellular digestion

Question 8

Sponge openings

Answer 8

Ostia (in) -pores
Osculum (out) - main opening

Question 9

Reproduction

Answer 9

Monoecious hemaphrodites.
Males and female sex organs
No genetic variation

Question 10

Gemmules

Answer 10

Granules covered in spicules
Provide environmental resistance
Demosponges

Question 11

Where is the egg is produced?

Answer 11

Ameobocyte

Question 12

What lines the inside if the sponge?

Answer 12

Choanocytes
Microvilli draw food and water through the sponge

Question 13

What cells protect outside?

Answer 13

Flattened epithelial cells

Question 14

Choanoflagellates

Answer 14

Eukaryotes similar to sponges
Collard flagellates with choanocytes

Question 15

Nervous system

Answer 15

No

Question 16

Jelly filling that provides structure

Answer 16

Mesophyl

Question 17

Spicules

Answer 17

Support, protection, and locomotion
Glass, silica, or calcium carbonate

Question 18

Class Hexactnellida

Answer 18

Glass (silica) sponges
No spongin

Question 19

Class calcarea

Answer 19

Calcareous sponges composed of calcium carbonate. No spongin

Question 20

Demosponges

Answer 20

Have spongin and spicules

Question 21

Sclerospongin

Answer 21

Coralline sponges
Layered calcium carbonate