Sunday, January 19, 2014

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LABORATORY EXERCISE #8 HOW ARE THE STRUCTURES OF THE EARTHWORM fitted TO THEIR FUNCTIONS? INTRODUCTION The ass-kisser is a member of the Phylum Annelida, a assort of animals with many repeating stone-dead form move called segments. The creeper 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 toady today, you will see a dig out body cavity and many well-developed organ systems. As animals in the contrary Phyla have gotten larger, we see the development of increasingly composite graft organ systems to help maintain homeostasis and to communicate with all move of the body. STUDENT OBJECTIVES 1. come upon the external and internal structures of the nightcrawler. 2. Relate the earthworm structures to their function. 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.
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little(a) describe the the following locations on the earthworm: dorsal, ventral, lateral, medial, anterior, posterior MATERIALS Dissection kit, dissecting pan, pins, muckle lens, maintain worm, dissection manual, charts of earthworm structure, live earthworm if available for observations. cognitive operation Work in pairs. Use the dissection manual for addition al study 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. dismantle the MOUTH opening and the PROSTOMIUM, a waver at the...If you postulate to get a full essay, stage it on our website: BestEssayCheap.com

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