The water circulation system of sponges, also known as canal system, is the defining property of the phylum Porifera. The system of canals is also known as the auriferous system. The sponge canal system aids in food uptake, respiratory gas exchange, and excretion. Many pores on the body surface of sponges allow for the admission … Read more
What is Phylum Platyhelminthes? Definition of Phylum Platyhelminthes Phylum Platyhelminthes, also known as flatworms, comprises bilaterally symmetrical, triploblastic, dorsoventrally flattened invertebrates lacking circulatory, respiratory, and skeletal systems, characterized by a simple digestive system with a single opening and a protonephridial excretory system. Characteristics of Phylum Platyhelminthes Classification of Phylum Platyhelminthes Class 1- Turbellaria (L., turbella= a little … Read more
What is Phylum Porifera? – Definition of Phylum Porifera Phylum Porifera refers to a group of simple, sessile aquatic animals commonly known as sponges. Sponges lack true tissues and organs and have a porous body structure with numerous channels and chambers that allow water to flow through them. They feed by filtering small particles from … Read more
Origin of Parazoa Choanoflagellate: Link to sponges Sponges’ internal chambers are bordered by a series of specialised cells known as choanocytes (choano = collar; cyte =cell). These are the cells that feed sponges. Each choanocyte, like choanoflagellates, possesses a collar of tentacles enclosing a single anterior flagellum. By undulating dozens of flagella, choanocytes generate a … Read more
Reproduction in Protista Methods of Reproduction in Protists The following paragraphs emphasise the two essential reproductive strategies of protists. The procedures are: A. Asexual Reproduction in Protists Mode of Asexual Reproduction In Protista 1. Binary Fission Mitosis is the division of the parent cell into two identical daughter cells. Examples: Amoeba, Euglena and Paramecium. 2. … Read more
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