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Structural Organisation in Animals
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  1. The simplest type of canal system in Porifera is
    1. ascon type
    2. leucon type
    3. sycon type
    4. radial type
Correct Option: A

Presence of canal system - a network of channels for water transport - is an important feature in sponges. Ascon type of canal is simplest in Porifera which brings in food, oxygen and carries away CO2 and nitrogenous waste.


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