Problem 15

Background and context

• Phylum nematodes include cylindrical shaped worms.
• They are also called roundworms.
• They have false body cavity called pseudocoel.
• Fertilization is internal that means it takes place inside their body.
• Process of embryo formation is called embryogenesis.
• Embryonic development include several larval stages.
• Pattern of development remains almost similar among them.
• One larval form transforms into another by the process of molting or ecdysis.
• Nematodes are mostly parasites which need host to complete life cycle.