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SS1: BIOLOGY - 1ST TERM

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



Lesson 7, Topic 7
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Theory Questions – Kingdom Animalia I

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Topic Content:

  • Theory Questions & Answers – Kingdom Animalia I

Theory Questions – Kingdom Animalia I

1. State the characteristics of the following phyla:

(a) Porifera

(b) Cnidarian

(c) Platyhelminthes

(d) Nematoda

2. Name three organisms that belong to each of the phyla named above.

3. (a) Make a labelled diagram of a tapeworm.

 

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Theory Questions – Kingdom Animalia I

1. State the characteristics of the following phyla:

(a) Porifera

Answer:

 Characteristics of members of the phylum Porifera:

  • They are aquatic, mainly marine.
  • They have bodies perforated by many pores.
  • They are multicellular but exist at the cellular level of the organization of life.
  • They reproduce sexually (as hermaphrodites) and asexually by budding and fragmentation.
  • They have a distinctive larval stage which is planktonic.
  • They are asymmetrical (no body symmetry).
  • No nervous, circulatory or digestive system.
  • Have a skeleton made up of spicules.
  • They are sessile filter feeders.
  • They have great power of regeneration
  • No true tissues
  • They lack a true body cavity

 

(b) Cnidarian

Answer:

Characteristics of members of Phylum Cnidarian or Coelentrata:

  • They are mostly aquatic, mostly marine
  • They are diploblastic (two distinct body layers) separated by mesoglea
  • They are at the tissue level of organization of life
  • They are radically symmetrical
  • They have only one body cavity (enteron) with one opening the mouth and no anus

 

(c) Platyhelminthes

Answer:

Characteristics of Platyhelminthes:

  • They are flatworms.
  • They are parasitic or free-living.
  • They are acoelomates (no body cavity).
  • Bilaterally Symmetrical.
  • Free-living ones have definite heads (cephalization). Absence of cephalization in the parasitic ones.
  • Reproduce sexually and asexually.
  • They are hermaphrodites.
  • They are triploblastic.
  • They have organ level of organization with no specialized circulatory or respiratory structures.
  • Gaseous exchange is by diffusion.

 

(d) Nematoda

Answer:

Characteristics of Nematodes:

  • They are triploblastic.
  • They are bilaterally symmetrical.
  • They exhibit tissue level of organization
  • They have a false body cavity or pseudocoelom.
  • They are free-living or parasitic.
  • Reproduce sexually and fertilization is internal.
  • They have an alimentary canal with a mouth and anus.
  • They have separate sexes.
  • Anterior end shows a degree of Cephalization

 

2. Name three organisms that belong to each of the phyla named above.

Answers:

  • Porifera – Sponges
  • Cnidaria – Corals, hydra, Obelia, Jelly-fish, Sea anemones
  • Platyhelminthes – Tapeworm, Liver fluke, Planaria
  • Nematoda – Roundworm, Hookworm, Pinworm

 

3. (a) Make a labelled diagram of a tapeworm.

Tapeworm

 

(b) State the adaptations of tapeworms to parasitic life.

Answer:

  • Possession of hooks and suckers for attachment to the host.
  • Possession of specialized body wall to resist host digestive juices
  • Thin and flattened and have a large surface area for absorption of nutrients from the host’s intestine
  • They lack a digestive system and the reproductive system is well-developed.
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