Multiple choice

Canal system is present in phylum:

  1. Annelida

  2. Porifera

  3. Acanthocephala

  4. Echinodermata

  5. Arthropoda

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Porifera (sponges) possess a unique canal system that circulates water through their bodies for filter feeding, gas exchange, and waste removal. Water enters through ostia, passes through choanocyte chambers, and exits through the osculum. Annelida, Acanthocephala, Echinodermata, and Arthropoda do not have this canal system.