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Animal Kingdom — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnimal Kingdom3 Marks
Question
Describe the canal system of sponges.
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Answer

  • The characteristic canal system through which water circulates, helps in nutrition, respiration and excretion of the animal.
  • Body wall has a number of small openings, called ostia, through which water enters the body.
  • Through radial canals, the water reaches the spongocoel.
  • Water carrying wastes comes out through a large terminal opening, called osculum.
  • Spongocoel and the canals are lined by flagellated collar cells, called choanocytes.

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