Faat- Laboratory Report 3 iedt SIMPLE ANIMALS Student Lab Instructor Find functi
ID: 191509 • Letter: F
Question
Faat- Laboratory Report 3 iedt SIMPLE ANIMALS Student Lab Instructor Find functions 1 an 1. SPONGES a Write the term that matches the phrase. Detemmine 2 Type of symmetry 3. Cells that create the water currenmt 4 Cells that engulf and digest food s. Skeletal elements of sponges A Trace the path of water flowing through Grantia e Describe the manner of feeding and the distribution of sutrients. Out 2. CNIDARIANS a Write the term that matches the phrase. 1. Type of symmetry 2. Type of body plan 3. Embryonic tissues present 4. Level of organization 5. Contraction enables movement 6. Coordinates movement 7. Special cells used to capture prey 8. Method of nutrient dispersal b Distinguish the following stages by structure and function: Polyp Medusa 39Explanation / Answer
1) Sponges:
A. i) Level of organization - Cellular-level organization.
Sponges have cellular-level organization. Their cells are specialized so that different cells work different functions but similar cells are not organized into tissues and bodies are a sort of loose aggregation of different kinds of cells.
ii)Type of symmetry - Asymmetrical body plans.
Only sponges have asymmetrical body plans.
iii)Cells that create the water current - Choanocytes.
Choanocytes is the cell type, which is responsible for water current for the sponge. Another function for choanocytes is to captures food particles.
iv) Cells that engulf and digest food - Phagocytic cells.
The special cells of the sponge include filter sea water; cells that are phagocytic, which engulf and digest food particles.
v) Skeletal elements of sponges - Sponges have diverse skeletal elements, which include calcareous laminae, organic filaments, and siliceous and calcareous spicules.
B) In-inter current pores - radial canals - spongocoel - osculum - out.
Water flow through Grantia: Beating flagella of choanocytes move water, which contains food part. from outside into incurrent canal then, water flows through folded wall, which is lined with choanocytes into flagellated canal, spongocoel and out with the help of osculum.
C) Sponges do not have a nervous, digestive or circulatory system. They rely on keeping up a constant water flow through their bodies to obtain food and oxygen and to remove wastes.
Sponges have a unique feeding system. They have tiny pores known as ostia in the place of mouth in their outer walls through which water is drawn. Cells in the sponge walls filter food from the water and water is pumped through the body and the osculum known as little mouth. The flow of water through the sponge is only in one direction and driven by the beating of flagella which line the surface of chambers connected by a series of canals. Sponge cells perform many bodily functions and appear to be more independent of each other. They capture food particles in water, which passes through their body. They resembles a sac perforated with pores -water is drawn through pores into a spongocoel and flows out of the sponge through larger opening known as osculum-choanocytes, it is a line interior of spongocoel, flagellated, engulf bacteria and other food particles by the process of phagocytosis and diffusion help in the removal of waste across the membranes of mesohyl cells - moebocytes to take up food from surroundings and choanocytes digest it and transmit nutrients to other cell.
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