Porifera

Question 1

Recognizable cell types surrounding or the internal cavity of porifera?

Answer 1

Spongocoel

Question 2

The simplest body wall is approximately two cell layers thick with a gel like substance called the

Answer 2

mesenchyme

Question 3

A a gelatinous matrix that contains skeletal elements and archeocytes or amebocytes.

Answer 3

Mesenchyme, also known as mesohyl.

Question 4

sponges are closely related to the group of

Answer 4

Protozoan Protists called the
Choanoflagellates

Question 5

small openings are pores where water is
drawn into the sponge

Answer 5

Ostia

Question 6

water exits the sponge through

Answer 6

Oscula or Osculum

Question 7

Living species of sponges belong to three (3) distinct groups. What are those?

Answer 7

Hexactinellida (glass sponges)
Demospongia
Calcarea (calcareous sponges)

Question 8

Give 5 Poriferan Characteristics

Answer 8

Are commonly referred to as sponges
multicellular heterotrophs
body plain is asymmetrical
they don’t have tissues and organs
they are filter feeders and sessile.

Question 9

Organisms found under the bottom of the sea are called?

Answer 9

Benthic

Question 10

Where swimming or floating organisms live in a water column

Answer 10

Pelagic

Question 11

Give at least 4-5 characteristics of feeding of sponges

Answer 11

….

Question 12

Reproduction of Poriferans. It is both?

Answer 12

Both asexual and sexual.

Question 13

Known as glass sponges, are characterized by siliceous spicules consisting of six rays intersecting at right angles, much like a toy jack

Answer 13

Hexactinellida

Question 14

Are the only sponges that possess spicules composed of calcium carbonate. These spicules do not have hollow axial canals.

Answer 14

Calcarea

Question 15

The most diverse sponge group

Answer 15

Demospongia

Question 16

Three categories,
based on their canal systems.

Answer 16

asconoid, syconoid
and leuconoid.

Question 17

A sponges that have the simplest type of
organization in canal system.

Answer 17

Asconoid

Question 18

Create the current to expel it
through a single osculum

Answer 18

Choanocyte flagella

Question 19

Water that enters the sponge through a modified cell known as a?

Answer 19

porocyte

Question 20

larger versions of asconoids (with more infoldings), still having just a single osculum.

Answer 20

Syconoid

Question 21

sponges are the most complex in design in
that not all the chambers are flagellated

Answer 21

Leuconoid

Question 22

outer layer of the sponge

Answer 22

pinacocytes

Question 23

collar-flagellated cells

Answer 23

choanocyctes

Question 24

mobile cells suspended in jelly like materials

Answer 24

amoebocyctes