Introduction to Invertebrates EXPERIMENT 2: OBSERVING PORIFERA Data Sheet Upload your drawn and labeled picture of Neofibularia nolitangere along with this assessment document. Post-Lab Questions 1. Which cells are responsible for drawing the water into the sponge? 2. What is the name of the opening where the water is expelled from the sponge? 3. What hard structures provide structure to the sponge and can be used to identify the species?
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The cells responsible for drawing water into the sponge are called choanocytes or collar cells. Show more…
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Invertebrates Invertebrates Pre-Lab Questions 1. Before reading the introduction, were you familiar with examples of species from each of the eight phyla? Explain. 2. What is the main difference between the Cnidaria and the Platyhelminthes phyla? 3. Conduct your own research to locate images/charts/figures that illustrate the evolution of invertebrates. Pick the one you found most useful, insert the picture below and write a one paragraph summary of what you learned from this image and why you like this one the best from those that you viewed.
Josee P.
8. Describe sexual reproduction of Porifera, including details about the life cycle. (1 mark) 9. What structures and materials make up the skeletons of Porifera? Describe and draw a sketch (1 mark) Complete the table by writing a cell type or structure in sponges that fits each description. (4 marks) Type of Cell or Structure Description 10. Aid in reproduction and nutrient transport. Helps produce spicules. 11. Form the outside surface of the sponge body. Contract to close porocytes. 12. Line the interior of sponges' body. Use flagella to draw water through pores. 13. Found as a jellylike substance between the two layers. Make up sponges' support system.
Suman K.
L. porus (pore); ferre (to bear). The sponges belong to phylum Porifera. Unlike the rest of the animal kingdom, they have a loose body organization. There are approximately 5000 marine species and 150 freshwater species of sponges. Sponges live at all depths in the sea and range in size from a few millimeters up to 2 m. Water carrying food and oxygen is drawn through the sponge through pores by the beating of flagella on the choanocytes (cells that line the internal cavity). Using your textbook and the PowerPoint slides, answer the following questions about the key characteristics of the phylum Porifera: Type of symmetry: Do sponges have distinct cell layers or tissues and organs? Name the cells of the inner cell layer and their features: How do sponges get food and energy? How do sponges move?
Adi S.
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