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Kingdom Animalia — Bio Zoology STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11Bio ZoologyKingdom Animalia3 Marks
Question
Write the general characters of cephalochordates.
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Answer

  • They are marine found in shallow waters.
  • They lead a burrowing mode of life.
  • They are fish-like with a notochord, nerve cord, and pharyngeal gill slits throughout their life.
  • A closed type of circulatory system is seen without a heart.
  • Excretion is by protonephridia.
  • Sexes are separate.
  • Fertilization is external.
  • Development is indirect with a larva e.g. Amphioxus.

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