Roundworms are unsegmented worms that have pseudocoeloms and
digestive systems with two openings: a mouth and an anus.
Parasitic roundworms include trichinosis- causing worms,
filarial worms, ascarid worms, and hookworms
Reproduction in
nematode:
Roundworms reproduce sexually, and most species of
roundworms have separate males and females . Roundworms reproduce using
internal fertilization. Usually, the male deposits sperm inside the female’s
reproductive tract. Parasitic roundworms, such as hookworms or ascarid worms,
often have complex life cycles that involve two or three different hosts or
several organs within a single host.
Respiration in
nematode:
Like flatworms,
roundworms exchange gases and excrete metabolic waste through their body walls.
They have no internal transport system. Therefore, they depend on diffusion to
carry nutrients and waste through their bodies.
