Chapter 11

Question 1

When earthworms mate, the _______ secretes mucus to hold them together.

Answer 1

Clitellum

Question 2

Reproduction in the earthworms involves

Answer 2

Cross-fertilization between two hermaphroditic individuals

Question 3

True/False

Clam worms and fanworms are members of the class Errantia

Answer 3

False

Question 4

True/False

Annelids grow by producing new segments at the anterior end

Answer 4

False

Question 5

The organs of excretion in the earthworm are ______

Answer 5

Nephridia

Question 6

Most annelids possess tiny bristles called

Answer 6

Setae

Question 7

The circulatory system in the earthworm

Answer 7

Uses the dorsal vessel as the main pumping organ

Question 8

Leeches secrete both an anesthetic and ______ in their saliva

Answer 8

Anticoagulant

Question 9

True/False

Earthworms possess paired fleshy appendages called parapodia

Answer 9

False

Question 10

Movement in the annelids involves

Answer 10

Longitudes and circular muscles

Question 11

The paired appendages used for locomotion in polychaetes are called

Answer 11

Parapodia

Question 12

Leeches are found predominantly in freshwater habitats, but some are marine and a few are terrestrial.

Answer 12

True

Question 13

The following characteristics are typical of annelids

Answer 13

Segmentation, closed circulation, and nephridia

Question 14

Leeches typically lack both setae and septa

Answer 14

True

Question 15

The larva of polychaetes is

Answer 15

A trochophore