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LABORATORY EXERCISE #8 HOW ARE THE STRUCTURES OF THE EARTHWORM alter TO THEIR FUNCTIONS? INTRODUCTION The ass-kisser is a member of the Phylum Annelida, a chemical group of animals with many repeating doomed organic structure move called segments. The fishworm is a nocturnal animal which prefers rich, damp soil. By ingesting and digesting dead organic matter in the soil, and by aerating the soil it burrows, the wriggler plays an important part in better the fertility of your garden or the farmers field. As you dissect the angleworm today, you will see a dig out body cavity and many well-developed organ systems. As animals in the distinguishable Phyla have gotten larger, we see the development of increasingly composite plant life organ systems to help maintain homeostasis and to communicate with all separate of the body. STUDENT OBJECTIVES 1. uphold the external and internal structures of the crawler. 2. Relate the earthworm structures to their fu nction. 3. Become familiar with terms relating to body orientation. PRE-LAB QUESTIONS 1. Why do we say earthworms have a tube within a tube structure? 2. Describe ingestion, digestion, and egestion in earthworms. 3. Earthworms are hermaphroditic. Explain. 4.

minuscule describe the the following locations on the earthworm: dorsal, ventral, lateral, medial, anterior, posterior MATERIALS Dissection kit, dissecting pan, pins, turn lens, maintain worm, dissection manual, charts of earthworm structure, live earthworm if available for observations. purpose Work in pairs. Use the dissection manual for additional learning and diagrams. I! . External Observation 1. put together up the earthworm. Observe the color and the segments along the whole duration of the body. There is a smooth band which almost encircles the worm. This is called the CLITELLUM which secretes mucus for reproductive purposes. The clitellum is of all time closest to the front end or ANTERIOR end. degrade the MOUTH opening and the PROSTOMIUM, a waver at the...If you unavoidableness to get a full essay, stage it on our website: BestEssayCheap.com

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