What are the key characteristics or features of roundworms?

Question

2)describe body plan.
3)describe habitat.
4)give some examples of animals in this phylum that show variety in the group.
5)what do animals in this phylum eat?
which animals are their predators?
6)how do animals in this phylum reproduce?

Answer 1

Key characteristics of the phylum Nematoda:
1. They contain three cell layers.
2. They possess bilateral symmetry.
3. They are pseudocoelomates. Their body cavity is partially lined with mesoderm so they call it a false body cavity.
4. They possess a one way digestive system. Mouth, intestine and anus.
5. They contain separate sexes. The female being the larger of the pair. Females are capable of producing 100 of thousands of eggs per day. The male usually dies after copulation.
6. Many of the phylum are free living worms but some are parasitic and cause many terrible diseases all throughout the world.
7. They have a circular brain and several longitudinal nerve cords.
8. The nitrogenous waste is collected by two lateral canals and emptied from the body through an excretory pore located in the head area.
9. They contain longitudinal muscles only. This makes it difficult for the worm to move in a coherent manner.
10. Their body is covered with a tough cuticle. This prevents the parasitic worms from being digested and the free living worms from drying out.
Parasitic worms exhibit a complex life cycle but much of the cycle is shared by most of the parasites. The mode of entry into the host vary from injection by an insect, to drinking egg fill contaminated water. Once the eggs or larvae make it into the body the organisms take a 10 day trip around the body growing and developing. After the trip is over most of them come out in the lungs and crawl up to the throat, where they are reswallowed into the intestine where they take up residence. Worms like the Trichina worm enter the muscle tissue and remain their until someone eats them. Filarial worms enter the lymph canals and block them causing massive swelling.

Answer 2

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RE:
What are the key characteristics or features of roundworms?

Answer 3

Nematoda Characteristics

Answer 4

Roundworms belong to the phylum Nemathelminthes. Ascaris is a common e.g. These animals show bilateral symmetry. Generally females are longer than males. Body is covered by cuticle. They mostly lead a parasitic life, for e.g. Enterobius. Reproduction is sexual. Females can lay upto 2,00,000 eggs at a time. As they are parasitic, they obtain their nutrition from the host. Infected persons are treated medically.

Answer 5

key characteristics features roundworms

Answer 6

key characteristics of roundworms:
(1) bilateral symmetry, but circular cross-section
(2) hydrostatic motion and mostly longitudinal muscles, thus motion is thrashing (no antagonistic muscles)
(3) outer covering a protective, collagenous cuticle
(4) mostly dioecious, males with copulatory spicules (for mating)
(5) complete digestive system
(6) no circulatory and respiratory system (diffusion only)
(7) unique nervous system in that muscles reach to nerves (unlike the usual that the nerves are the one that reach out to the muscles)

Answer 7

Google would give you a good response to this. Here's a link for characteristics of roundworms, such as types of organs, sexual reproduction, and body plan: http://www.coolschool.ca/lor/BI11/unit11/U11L02.htm

Answer 8

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