Roundworms are characterized by a simple worm-like structure with a lack of features such as cilia or a well-defined head. They have an internal body cavity, called a pseudocoelom, which looks like a tube within a tube and runs the whole length of their bodies. 29 июл. 2019 г.
What is the characteristics of roundworms?
Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. Their body plan is simple. The cuticle is secreted by and covers a layer of epidermal cells.
What is the basic structure of a roundworms digestive system?
Roundworms have tube digestive systems, meaning ingested food travels a single route. It enters through the mouth, is ground down in the pharynx, is digested in the gut, and is eliminated from the anus. The mouth is on one end of the body and the anus is on the opposite end.
What is the structural characteristics which makes many round worms survive as parasites inside the body of their hosts?
Roundworms have a tough covering of cuticle on the surface of their body. It prevents their body from expanding. This allows the buildup of fluid pressure in the pseudocoelom. As a result, roundworms have a hydrostatic skeleton.
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