Sponges

Question 1

What are the classes of phylum ponifera? What sub kingdom are they under? Tissue? Body plan? Symmetry?

Answer 1

1. Class Calcarea (calcium carbonate spicules), Class hexactinellida (silica spicules) Class Demospongiae (spongin spicules) 2. Subkingdom Parazoa 3.No tissue 4. Diploblastic (implying sac body, 2 germ layers, etc.) 5. Assymetrical

Question 2

how do sponges reproduce?

Answer 2

Most are hermaphroditic (function as both male and female

Question 3

How do they feed?

Answer 3

sponges are filter feeders

Question 4

What is mesohyl?

Answer 4

A jelly-like layer between the epidermal cells and the Choanocytes.

Question 5

what do ameobocytes do?

Answer 5

Ameobocytes receive food from the surrounding water and from the Choanocytes, digest it and distribute it. Also may get rid of waste or store food.

Question 6

What are ameobocytes? In what phyla do we find them? How did they get their name?

Answer 6

They are cells that carry out digestive functions for the sponge. Phylum Ponifera Name comes from their use of pseudopodia (false feet) like amoeba.

Question 7

Describe flow of water during filter feeding in a typical sponge.

Answer 7

Water flows in through pores into the central cavity known as the SPONGOCOEL at which point ameobocytes and Choanocytes collect food particles in the water. water flows out through the main opening called the OSCULUM

Question 8

type of digestion?

Answer 8

intracellular

Question 9

oscullum?

Answer 9

Main opening

Question 10

What are Choanocytes? What is their other name?

Answer 10

1. They are flagellated cells that line the interior of the spongocoel. the beating of their flagella helps bring water in through the pores. 2. Also known as Collar cells because their fingerlike projections that form a “collar” around the flagella.

Question 11

what do Choanocytes do?

Answer 11

engulf bacteria and food particle by phagocytosis and either digests them or gives them to the ameobocytes for distribution