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  4. Animals which possess collar cells and an osculum as characteristic features belong to phylum:

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Q. Animals which possess collar cells and an osculum as characteristic features belong to phylum:

NTA AbhyasNTA Abhyas 2020Animal Kingdom

Solution:

Members of phylum Porifera are commonly known as sponges. Sponges have a water transport or canal system. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. Choanocytes or collar cells line the spongocoel and the canals.