Question 1

Which phylum is characterized by sessile and free-living modes of life, radial symmetry, and lacks cephalization and a blood system?

Accepted Answer

Cnidaria

Question 2

Animals with bilateral symmetry can be cut into two mirror images by how many vertical planes through their center?

Accepted Answer

Exactly one

Question 3

What is the term for the concentration of nerve cells at the anterior end of a bilaterally symmetrical animal's body?

Accepted Answer

Cephalization

Question 4

Which phylum has a triploblastic body, a closed blood system, and is coelomate with two openings in the digestive tract?

Accepted Answer

Chordata

Question 5

Animals that have an ectoderm and an endoderm, separated by a non-cellular mesoglea, are classified as:

Accepted Answer

Diploblastic

Question 6

Which phylum includes free-living and parasitic forms, is bilaterally symmetrical, triploblastic, and acoelomate?

Accepted Answer

Platyhelminthes

Question 7

What type of symmetry is characterized by having a definitive oral and aboral side, but no left or right side?

Accepted Answer

Radial symmetry

Question 8

The phylum Porifera consists of animals that are:

Accepted Answer

Cellular level of organization and asymmetrical

Question 9

Which of the following is a characteristic of Arthropoda?

Accepted Answer

Open blood system (haemocoel)

Question 10

Animals that are triploblastic have how many germ layers in their developing embryo?

Accepted Answer

Three

Question 11

Which phylum is described as aquatic (fresh and sea water), terrestrial, and underground, with cephalization and an open blood system?

Accepted Answer

Arthropoda

Question 12

The term 'sessile' means an animal is:

Accepted Answer

Sedentary and attached to a substrate

Question 13

Which phylum possesses a coelom, is triploblastic, and has a closed blood system?

Accepted Answer

Annelida

Question 14

What is the primary disadvantage of radial symmetry mentioned in the text?

Accepted Answer

Slow and inefficient locomotion

Question 15

All bilaterally symmetrical animals are:

Accepted Answer

Triploblastic with three germ layers

Question 16

The body cavity in Arthropoda is often referred to as a:

Accepted Answer

Haemocoel

Question 17

Which phylum is characterized by having only one opening for both ingestion and egestion?

Accepted Answer

Platyhelminthes

Question 18

Animals that show radial symmetry have an extended:

Accepted Answer

Nerve net

Question 19

Which of these phyla are described as occurring everywhere, including terrestrial and aquatic environments?

Accepted Answer

Annelida and Arthropoda

Question 20

The ectoderm is the:

Accepted Answer

Outer germ layer

Comparative Study of Animal Phyla and Body Plans

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