Class 9
Chapter 7 Class 9 - Diversity In Living Organisms
  • They are diploblastic animals , in which, the body is made up of two layers of cells:
  • Ectoderm – One layer makes up the cells outside the body
  • Endoderm – the other forms the inner lining of the body.
  • These are mostly aquatic or marine habitat animals.
  • Body shows radial symmetry.
  • They have cavities in their body. Body cavity (coelom) acts as gastrovascular cavity i.e. coelenteron.
  • Respiratory, circulatory and excretory organs are absent .
  • They have a tissue level of organisation.
  • Sessile forms are called Polyps and free-living forms are called Medusa.

For example : Hydra, Sea anemone

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo