Friday, October 23, 2020

Animal Kingdom - Notes | Class 11 | Part 6: Aschelminthes

4. ANIMAL KINGDOM

PHYLUM ASCHELMINTHES (ROUNDWORMS): GENERAL CHARACTERS

  1. Grades of organization:
    • Organ system.
  2. Symmetry:
    • Bilateral symmetry.
  3. Germ layers:
    • Triploblastic.
  4. Coelom:
    • Pseudocoelomate.
  5. Habit and habitat:       
    • Aquatic and terrestrial. Free living or parasitic in plants & animals.
  6. Digestive system:          
    • Complete. Tubular alimentary canal with well-developed muscular pharynx.
  7. Respiratory system:
    • Absent
  8. Circulatory system:
    • Absent
  9. Reproduction:
    • Dioecious (Sexes are separate).
    • Sexual reproduction.
    • Internal fertilization.
    • Development is direct or indirect.
  10. Unique features:
    • Body is circular in cross section.
    • An excretory tube to remove body waste through excretory pore.
    • Male and female are distinct. Females are longer than males.
  11. Examples:
    • Ascaris (Roundworm)
    • Ancylostoma (Hookworm)
    • Wuchereria (Filarial worm).

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