Evaluate Basic External Animal Anatomy and Morphology - AgriSETA

Evaluate Basic External Animal Anatomy and MorphologyPrimary Agriculture NQF Level 1 Unit Standard No: 11617339 The footThe muscular foot is flat and large and makes up a large part of the body. The visceral humpBehind the head of the snail and above the muscular foot the visceralhump is situated. The internal organs are held together and protected by athin, strong skin called the visceral sac. On one side this skin makes a foldknown as the mantle. The part of the mantle, which projects beyond therim of the shell, is thickened by a great number of glands and is called themantle collar. The glands in it secrete gel. The breathing pore can be seenon the collar. The skeleton of a snailThe snail has a hydrostatic skeleton: the body iskept firm by water pressure. Large spaces in the bodyare filled with watery liquid and the pressure of thisliquid within the body makes the body firm andprovides a skeleton for the muscles to work against. Breathing pore in the collarThe snail breathes through its mantle. The cavity between the mantle andthe visceral sac is called the mantle cavity and it is connected to theoutside atmosphere by the breathing pore in the collar. Gaseous exchangeoccurs between the air in the mantle cavity and the blood in the mantle. Lifecycle of snailsThey lay eggs in damp soil that are later hatched. The small snails developto adult snails in South-Africa in approximately 10 months and in otherparts like California in America in up to 12 months.My Notes …. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Version: 01 Version Date: July 2006