Ch. 11: Annelids

Question 1

In annelids, what is the name of their first segment?

Answer 1

Prostomium (contains sensory organs)

Question 2

What is the digestive system of Annelids?

Answer 2

Complete with anus

Question 3

Circulatory system of Annelids

Answer 3

(closed) Blood is transported via dorsal and ventral vessels

Question 4

Excretory system of Annelids

Answer 4

By metanephridia on each segment

Question 5

Nervous system of Annelids

Answer 5

Dorsal brain and ventral cord

Question 6

Classes in Phylum Annelida

Answer 6

1. Oligochaeta
2. Hyrudeinea
3. Polychaeta

Question 7

Class Oligochaeta

Answer 7

• Earthworms
• Lack parapodia
• Deposit feeders
• Hermaphroditic
• Gonads in clitellum

Question 8

Class Hyrudeinea

Answer 8

• Leeches
• Ecto-parasites
• No internal septa
• Hermaphroditic
• Clitellum and cocoon

Question 9

Class Polychaeta

Answer 9

• Bristle worms
• Parapodia
• Acicula (chitin rods)
• Prostomium: holds mouth
• Pygidium: holds anus

Question 10

Body symmetry

Answer 10

Bilateral (metameric)