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Question

Are cnidarians diploblastic or triploblastic?


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Solution

Germ layers

  1. During embryonic growth, the cells undergo division and categorize into different layers, each capable of giving rise to a set of tissues and organs. Based on the number of germ layers, organisms are divided into the following types.
  2. Diploblastic organisms have two embryonic layers- the endoderm and ectoderm and lack the mesodermal layer.
  3. Triploblastic organisms have all three embryonic layers- endoderm, mesoderm, and ectoderm.

Cnidarians:

  1. All cnidarians are diploblastic. They also show a tissue level of organization.
  2. Example: Actiniaria (sea anemone), Pennatula (sea pens).

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