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Class 9
Chapter 7 Class 9 - Diversity In Living Organisms
  • These animals are bilaterally symmetrical, triploblastic.
  • They show a new feature of body design, namely a notochord , at least at some stages during their lives.
  • The notochord is a long rod-like support structure (chord=string) that runs along the back of the animal separating the nervous tissue from the gut.
  • It provides a place for muscles to attach for ease of movement.
  • Protochordates may not have a proper notochord present at all stages in their lives or for the entire length of the animal.
  • Protochordates are marine animals.

For Example: Balanoglossus, Herdmania and Amphioxus 

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Maninder Singh

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