Aqua Sci Porifera

Question 0

What do suspension feeders use?

Answer 0

Choanocytes which drive water through canals and chambers, incidentally capturing minute particles of food

Question 1

How are sponges different from other multicellular organisms

Answer 1

Cells are not arranged to form permanent tissues or organs

Question 2

Classification is based according to the _______ of the internal skeleton

Answer 2

Chemical composition

Question 3

Types of sponges

Answer 3

Calcarea, hexactinellida, demospongiae, sclerospongiae

Question 4

Pinacocyte

Answer 4

Thin, flat cells that line the outer surface of a sponge

Question 5

Choanocyte

Answer 5

Flagellated cells that have a collar-like ring of microvilli (digestion aids) surrounding the flagellum

Question 6

Spicule

Answer 6

Microscopic needle-like spikes; composed of silica or calcium carbonate

Question 7

Spongin

Answer 7

A fibrous protein made of collagen (what commercial sponges are made of)

Question 8

Ostium

Answer 8

Opening for water to enter the sponge; multiple in numbers

Question 9

Osculum

Answer 9

Opening for outgoing water

Question 10

Spongocoel

Answer 10

Main chamber of the sponge

Question 11

Porocyte

Answer 11

Opening of invaginations of the body wall (incurrent canals)

Question 12

Asconoid

Answer 12

The simplest and least common; flagellar movements of the choanocytes create a current in which microscopic food particles are caught; often vase or cylindrical in shape

Question 13

Synconoid

Answer 13

Body form appears to be folded; water enters the spongocoel through dermal pores; fold form radial canals which are lined with choanocytes

Question 14

Leuconoid

Answer 14

Have extensively branched calal system; water enters through ostia, through incurrent canals which lead to choanocyte chambers and out through excurrent canals which lead to choanocyte chambers and out through excurrent canals to osculum;
No spongocoel is present