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Kingdom Animalia — Bio Zoology STD 11 — Question

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

  • They are marine, sessile, pelagic or free-swimming.
  • Body is unsegmented and covered by a test or tunic.
  • Ault forms are sac-like.
  • Coelom is absent.
  • Notochord is present only in the tail region of the larval stage.
  • Heart is ventral and tubular.
  • Nerve cord is present only in the larval stage.
  • They are hermaphrodites and development is indirect with a free-swimming tadpole larva.
  • Retrogressive metamorphosis is seen e.g. Ascidia.

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