1. Cnidoblasts or nematoblasts are stinging cells found in cnidaria or coelenterata. Each of them bears a stinging cell organelle called nematocyst which is used in offence, defense and attachment of the animal.

    Cnidoblasts or nematoblasts are stinging cells found in cnidaria or coelenterata. Each of them bears a stinging cell organelle called nematocyst which is used in offence, defense and attachment of the animal.

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  2. Choanocyte or collar cell is a unique cell type of porifers which contains a flagellum surrounded at its base by a thin cytoplasmic collar. This cell creates current and ingest food particles from water.

    Choanocyte or collar cell is a unique cell type of porifers which contains a flagellum surrounded at its base by a thin cytoplasmic collar. This cell creates current and ingest food particles from water.

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  3. Parazoa are animals whose body consists of loosely aggregated cells, e.g., Porifera.

    Parazoa are animals whose body consists of loosely aggregated cells, e.g., Porifera.

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  4. It is a type of body organisation of animals which is based on cells that are not organised into tissues

    It is a type of body organisation of animals which is based on cells that are not organised into tissues

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  5. Nonchordates are those animals in which notochord is not present

    Nonchordates are those animals in which notochord is not present

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