Water Canal System in Sponges Notes PDF
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Dadhich Sir
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Summary
These notes explain the water canal system in sponges. Topics covered include general features, the sycon water canal system, diagrams, and the physiological importance of the canal. The notes are suitable for undergraduate students preparing for exams such as NEET, B.Sc., M.Sc., and CSIR NET.
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# Porifera (Sponges) ## Sycon Water Canal System - NEET - B.Sc. - M.Sc. - CSIR NET ### General Features (Porifera/Sponge): - Aquatic animals. - 90% marine, 10% fresh (10%) - Inactive in Nature - All members are sedentary. - Colony, branched, cylindrical. - Brown (slightly) in colour. #### Diag...
# Porifera (Sponges) ## Sycon Water Canal System - NEET - B.Sc. - M.Sc. - CSIR NET ### General Features (Porifera/Sponge): - Aquatic animals. - 90% marine, 10% fresh (10%) - Inactive in Nature - All members are sedentary. - Colony, branched, cylindrical. - Brown (slightly) in colour. #### Diagram of a Sycon - **Osculum** - **Ostia** - **Base** - **YouTube: DADHICH GROUP OF EDUCATION** ### Canal System (Sponges) - **Ascon Type** - **Sycon Type** - **Leucon Type** **Help in** - Nutrition, Respiration, Excretion, Reproduction. ### Sycon Canal System - **Osculum** - **Dermal ostia** - **Incurrent canal** - **Apopyle** - **Radial canal** - **Spongocoel** - **YouTube: DADHICH GROUP OF EDUCATION** ### Physiological Importance of canal: - Nutrition - Respiration - Excretion - Reproduction #### Explanation of terminology: - **Ostia** - These dermal pores are lined by thin membranes. Many pores hint - Open incurrent canal. - **Incurrent canal** - Present between radial canal. - **Prosopyles** - Joint with incurrent and radial canal. - **Radial canal** - Finger like projection lined by choenocytes. These canals are closed on the outside and remain open on the inside in the spongocoel cavity - **Apopyle** - Radial canal and spongocoel open. - **Spongocoel** - Big cavity hint in center. Lined by pinacocytes. Spongocoel are also non-flagellated. These cavity open outside through the osculum. - **Osculum** - Open outside. ### Mechanism of water circulation: - Water enters through the ostia. - Then it moves to the Incurrent canal. - Then it gets into the radial canal through prosopyles. - Flow continues through the apopyle to the spongocoel cavity. - Finally, exits out of the osculum.
