The Low Energy Demands of Nematodes Allow Them to Survive

Question

The low energy demands of nematodes allow them to survive without a
A) body cavity.
B) tubular gut.
C) reproductive system.
D) skeleton.
E) respiratory system.

Accepted Answer

Nematodes have low energy demands because they have a simple body plan and do not require a respiratory system since gas exchange can occur across their body surface. Therefore, they can survive without a respiratory system. However, they do have a tubular gut, reproductive system, and a pseudocoelom (which functions as a hydrostatic skeleton), so choices B, C, and D are incorrect. A body cavity may provide additional space for organs, but it is not a requirement for survival in nematodes.