Annelida

Question 1

Question: What is metamerism in Annelids?

Answer 1

Answer: Metamerism is the division of the body into a linear series of similar parts called metameres. Each metamere is separated by a transverse septum, acts as a hydrostatic skeleton, and contains longitudinal and circular muscles. Setae (chitinous bristles) are usually present on each segment for anchorage.

Question 2

Question: What are the advantages of metamerism?

Answer 2

Answer: Metamerism allows for increased burrowing efficiency, a more sophisticated nervous system, and provides a safety factor by repeating key organ systems in each segment.

Question 3

Question: Describe the nervous system of Annelids.

Answer 3

Answer: Annelids have a brain connected to a pair of ventral longitudinal nerve cords, with a ganglion in each segment.

Question 4

Question: How does the circulatory system function in Annelids?

Answer 4

Answer: Annelids have a closed circulatory system where blood is enclosed within vessels that run the length of the body, with several hearts (5 in earthworms) pumping the blood through this system.