Question

Why are nematodes more advanced than platyhelminthes?

Answer 1

Nematodes & Platyhelminthes:

Platyhelminthes have the following important characteristics:

1. They are triploblastic, acoelomate, & bilaterally symmetrical.
2. They may be free-living or generally parasites.
3. The body has a soft covering with or without cilia.
4. Their body is also dorsoventrally flattened without any segments and appears like a leaf.
5. They are devoid of an anus and circulatory system but have a mouth.
6. They respire by simple diffusion through the body surface.
7. They have an organ level of organization

The reasons for the success of the Nematoda as parasites probably include: - the presence of an environmentally protective cuticle, facultative diapause (like dauer stage of Caenorhabditis elegans), biochemical adaptations to existence in the extreme conditions, and the use of a variety of reproductive strategies.