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SS1: BIOLOGY - 1ST TERM

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  1. Introduction to Biology | Week 1
    6 Topics
    |
    1 Quiz
  2. Recognizing Living Things | Week 2
    3 Topics
    |
    1 Quiz
  3. Organisation of Life | Week 3
    3 Topics
  4. Classification of Living Organisms | Week 4
    7 Topics
    |
    1 Quiz
  5. Kingdom Prokaryotae / Monera & Kingdom Protista | Week 5
    3 Topics
    |
    3 Quizzes
  6. Kingdom Fungi & Kingdom Plantae | Week 6
    9 Topics
    |
    2 Quizzes
  7. Kingdom Animalia I | Week 7
    6 Topics
    |
    1 Quiz
  8. Kingdom Animalia II | Week 8
    5 Topics
    |
    1 Quiz
  9. The Cell | Week 9
    3 Topics
    |
    1 Quiz
  10. The Cell Structure and Functions | Week 10
    4 Topics
    |
    1 Quiz
  11. The Cell and its Environment | Week 11
    4 Topics
    |
    1 Quiz
  12. Nutrition in Plants | Week 12
    4 Topics
    |
    1 Quiz



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phylum nematoda
Phylum Nematoda.

Phylum Nematoda consists of nematodes or roundworms.

Characteristics of Phylum Nematoda:

Their characteristics are:

1. They are bilaterally symmetrical and triploblastic.

2. Body is long, slender, cylindrical and is encased in a cuticle, a flexible but tough exoskeleton, or external skeleton, which offers protection and support. The cuticle contains a carbohydrate-protein polymer called chitin. The body is pointed at both ends.

3. They exhibit tissue-level organization.

4. Their body has a false body cavity or pseudocoelom.

5. The alimentary canal is distinct, with a mouth and anus. (Digestive tract is complete and permanent.)

anatomy of nematodes
Anatomy of nematodes.

6. They are free-living or parasitic, the parasitic nematodes cause diseases in the host.

7. They are sexually dimorphic. i.e Sexes are usually separated with males smaller than females.

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8. Fertilization is internal and reproduction is sexual.

9. They lack a circulatory system and respiratory system, excretory organs are simple.

10. Examples are

  • Hookworms (Ancylostoma duodenale)
  • Human intestinal roundworm (Ascaris lumbricoides)
  • Guinea worms (Dracunculus medinensis)
  • Filarial worms (Wucheraria bancrofti)
  • Threadworms (Enterobius vermicularis)
Hookworm
Hookworms.

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