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symmetry, coelom and metamerism

basic idea of symmetry, coelom and metamerism

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symmetry, coelom and metamerism

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  1. Symmetry, Metamerism and Coelom Dr. DEEPAK RAWAL Assistant Professor Department of Zoology MLSU Udaipur

  2. Symmetry Def- arrangements of body parts/organs into geometrical axis/plans. Axis- imaginary line having two poles Advantages-Cepahlization, polarity, locomotion

  3. Symmetry Division of organisms on basis of symmetry 1. Asymmetrical- eg. Sponges 2. Symmetrical- Spherical Radial Bilateral eg. Volvoxeg. Echinoderms eg. Platyhelminthes -Chordates Cnidarians

  4. Symmetry

  5. Symmetry

  6. Metamerism Def- division of body into linear series of similar parts/sections. Each part is called segment/somite/metamere. Hox genes are responsible for this. Head/Prostomium Trunk Tail/Pygidium

  7. Metamerism

  8. Metamerism Types- External (eg. Arthropoda) Internal (eg. Chordata {ribs, vertebrae, somites etc.} Both (eg. Annelida)

  9. Metamerism Pseudometamerism/strobilizationeg. Taenia

  10. Coelom Def- fluid filled cavity between body wall and digestive tube covered on both side (outer and inner) by embryonic mesoderm. Triploblastic organisms AcoelomatesPseudocoelomatesCoelomates EnterocoelomatesSchizocoelomates

  11. Coelom

  12. Coelom

  13. Coelom

  14. Coelom Significance of Coelom: Provide space for viscera. Provide flexibility. Provide medium for circulation and nutrition. Shok protection. Collection of excretory matter.

  15. THANK YOU 1970-Y 1950-X

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