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Which body layer forms the skeleton in coelenterates?

Option: 1

Gastrodermis


Option: 2

Epidermis


Option: 3

Mesoglea


Option: 4

None of the above


Answers (1)

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Phylum Cnidaria / Coelenterata and Body Wall and Gastrovascular Cavity of Cnidaria -

Body Wall and Gastrovascular Cavity of Cnidaria:

  • The coelenterates show blind sac type of body plan. 
  • There is a central digestive gastrovascular cavity or coelenteron with a single opening that serves as both the entry and exit for material. 
  • This cavity is surrounded by the body wall that shows the following layers:
  • The outer epidermis derived from the ectoderm. It consists of epitheliomuscular cells and cnidocytes. They provide covering and perform muscular contraction. 
  • The inner gastrodermis derived from the endoderm. It surrounds the gastrovascular cavity. It consists of nutritive-muscular cells, gland cells and interstitial cells. Gonads are also derived from the cells of gastrodermis.
  • The middle layer is non-cellular and gelatinous. It is called the mesoglea. It forms the skeleton of cnidarians.
     

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The middle layer is noncellular and gelatinous. It is called the mesoglea. It forms the
skeleton of cnidarians.

Posted by

manish painkra

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