BIS 2C Annelida

Question 1

segmented body

Answer 1

segments marked externally and internally. body structures repeated in each segment

Question 2

hydrostatic skeleton

Answer 2

fluid filled cavity surrounded by muscles

Question 3

contraction of circular muscles

Answer 3

elongation of body segments

Question 4

contraction of longitudinal muscles

Answer 4

shortening of body segments

Question 5

polychaete reproduction

Answer 5

usually dioecious. external fertilization and trochophore larva

Question 6

clitellata reproduction

Answer 6

monoecious. internal fertilization. no trochophore larva

Question 7

Polychaeta

Answer 7

paraphyletic group
sand worms, tube worms, clam worms

Question 8

clitellata

Answer 8

oligochaete and leeches

Question 9

clitellata features

Answer 9

• lack parapodia and tentacles

Question 10

clitellum

Answer 10

thickened band in the middle of the body. secretes cocoon for protection of young

Question 11

leeches

Answer 11

predators and blood sucking. produce anesthetics, blood thinnners and widen blood vessels