Task 6. "Parasitic nematodes"

Subject: Type Roundworms (Nemathelminthes). Class Nematoda (Nematoda)

Task 1. “Roundworms”

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  1. The phylum Roundworms includes about (_) species.
  2. Roundworm habitats are (_), (_), (_) and (_).
  3. Roundworms studied in the school course belong to the class (_).
  4. Roundworms are characterized by (_) body cavity.
  5. Outside, the body of roundworms is covered (_).
  6. The musculature of roundworms is represented by (_).
  7. (_) first appears in the digestive system.
  8. The fluid of the primary body cavity performs a number of functions: (_).
  9. The excretory system is represented by (_) and (_).
  10. The nervous system is formed by (_) connected by ring bridges.
  11. Ability to regenerate (_).
  12. There were roundworms in the (_) era from the primitive (_).

Task 2. “Scheme of a cross section of a nematode”

Answer the following questions for the picture:

1. What is indicated in the figure by the numbers 1 – 11?

2. What is the primary body cavity filled with?

3. What is the skin-muscular sac formed by?

Task 3. “Scheme of a longitudinal section of a nematode”

Answer the following questions for the picture:

1. What is indicated in the figure by numbers 1 – 16?

2. What is characteristic of the digestive system of roundworms?

3. Where does the excretory system of roundworms open to the outside?

4. Where does the female reproductive system open to the outside? Males?

Task 4. “Organ systems of roundworms”

Fill the table:

Organ systems Peculiarities
Skin-muscular sac
body cavity

Task 5. “Characteristics of roundworms”

Which judgments are correct? Explain the answer.

  1. They belong to radially symmetrical two-layer animals.
  2. Bilaterally symmetrical three-layered animals.
  3. The body is flattened in cross section.
  4. The body is rounded in cross section.
  5. They have a cuticle and hypodermis.
  6. They have a tegument.
  7. The body cavity is absent, the space between the internal organs is filled with parenchyma.
  8. There is a primary body cavity (schisocoel).
  9. There is a secondary body cavity (general).
  10. The intestine has numerous blind outgrowths.
  11. The anal opening is absent.
  12. There is an anus.
  13. The respiratory and circulatory systems appeared.
  14. The respiratory and circulatory systems are absent.
  15. Separate organisms.
  16. Mostly hermaphroditic organisms.
  17. They lead only a parasitic way of life.
  18. There are both parasitic and free-living species.

Task 6. “Parasitic nematodes”

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