Chapter 6

Question 1

In sponges, respiration and excretion of various molecules is accomplished by

Answer 1

Diffusion

Question 2

True/False

Sponges are bilaterally symmetrical as juveniles but radially symmetrical as adults

Answer 2

False

Question 3

True/False

Choanocyte cells play a role in many sponge species.

Answer 3

True

Question 4

Cells that can differentiate into any other type of cell in sponges are the _________

Answer 4

Archaeocytes

Question 5

Members of the class _______ are named glass sponges, found in deep sea areas.

Answer 5

Hexactinellida

Question 6

True/False

The asconoid sponges have the simplest type of canal system

Answer 6

True

Question 7

The cells of a sponge that are responsible for water flow and capture of some particles are the

Answer 7

Choanocytes

Question 8

The water outlets in sponges are known as __________

Answer 8

Oscula

Question 9

The adaptive radiation of sponges is mainly due to:

Answer 9

A unique water current system

Question 10

Thin, epithelial-type cells covering the outer surface of sponges are the _______

Answer 10

Pinacocyte

Question 11

True/False

Lophocytes are ameboid cells that can differentiate into all other cell types

Answer 11

False

Question 12

The minute needle-like structures that act as a skeletal support system in sponges are called

Answer 12

Spicules

Question 13

The demosponges

Answer 13

Include the freshwater sponges

Question 14

The structural protein found in sponges is

Answer 14

Spongin