mollusca

Question 1

Name the four main distinguishing features of molluscs.

Answer 1

mantle, visceral mass, foot, shell

Question 2

What is adaptive radiation?

Answer 2

evolution of numerous species from common ancestor after migrating into new environment

Question 3

What symmetry are molluscs?

Answer 3

bilaterally symmetrical

Question 4

Are molluscs dioecious or monoecious?

Answer 4

dioecious

Question 5

Name the five main classes of mollusca.

Answer 5

gastropoda, cephalopoda, bivalvia, scaphopoda, polyplacophora

Question 6

What are the distinguishing features of gastropods?

Answer 6

well developed head, body undergoes torsion

Question 7

What are the distinguishing feature of bivalvia?

Answer 7

two part hinged shell, reduced head

Question 8

What are the distinguishing features of polyplacophora?

Answer 8

dorsal shell consists of eight overlapping plates, ventral body with head-foot

Question 9

What are the distinguishing features of scaphopoda?

Answer 9

body enclosed in one piece, curved conical shell, head absent

Question 10

What are the distinguishing features of cephalopoda?

Answer 10

foot modified into tentacles, shell greatly reduced, prominent head with eyes and beak, closed circulatory system

Question 12

Are the eyes in cephalopods related to eyes found in other animals?

Answer 12

no, convergent evolution