Practice question

In sponge aquiferous system water flow unidirectional enters via numerous microscopic dermal pores termed ostia into subdermal spaces, continues through incurrent canals via prosopyles into flagellated choanocyte chambers where beating flagella drives filtration trapping bacteria on microvillar collar, then passes through apopyles into excurrent canals merging into spongocoel central cavity and finally exits body through large apical opening osculum surrounded by contractile myocytes regulating diameter. Ostia serve incurrent, osculum exclusively exhalant vent maintaining pressure gradient for filter feeding. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative morphology