Nematodes move with characteristic whiplike movements.They are incapable of localized contractions along the body wall,similar to those observed in earthworms.Which of the following elements of nematode structure explain their particular form of locomotion? Check all that apply.
A) Nematodes have a collagenous cuticle that is flexible but tough.
B)Nematodes have both circular and longitudinal muscles associated with their body wall.
C)Nematodes are pseudocoelomate.
D) Nematodes have longitudinal muscles associated with their body wall.

Question

Quizplus · Accepted Answer

The body wall of nematodes has longitudinal muscles only.The cuticle and pseudocoelom interact to form a hydrostatic skeleton.Since there are no circular muscles in nematodes,the longitudinal muscles contracting against the hydrostatic skeleton produce only whiplike movements.These movements are characteristic of nematodes.

Nematodes Move with Characteristic Whiplike Movements