Lab #7: Introduction to the Kingdom Animalia Objectives: 1 ...

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Questions: 1. Can you suggest why, during the evolution of separate animal lineages, there has been a tendency for complexity to increase when body size increases 2. Sponges have folded walls. What advantage could this trait have for the sponge 3. Could you think of other organisms or organ systems that also have similar folded structures a. What advantages does folding provide for these organisms
Task 2: Differences between acoelomate and coelomate organisms A major developmental event in bilaterally symmetrical organisms (see below) was the development of a fluid filled cavity between the outer body wall and the gut (coelom). The coelom created a tube-within-tube arrangement allowing space for visceral organs and an increase in overall body size (Why). The coelom also provides support and aids in movement and burrowing in some animals. However, not all organisms are coelomates, some lack a coelom altogether and are called acoelomate (a = without) while others have a pseudocoelom (pseudo = false). Read page 413 (exercise 38) to learn more about these organisms. Examine the animals listed in the table below and fill out the missing sections. Sample Organism Acoelomate Pseudocoelomate Coelomate (p. 402) (p. 409) (p. 421) Phylum Platyhelminthes Nematoda Annelida Genus Dugesia Ascaris Lumbricus Common name Flatworms, planaria Roundworms Segmented worms, Earthworms Drawing of Cross section (slide) If specimens are available, dissect them longitudinally. Draw what you see.
Page 1 and 2: Lab #7: Introduction to the Kingdom
Page 3: Level of organization Protoplasmic
Page 7 and 8: Symmetry type Description Example P
Page 9 and 10: 3. Out of all the organisms you exa
Page 11: Radially-Symmetrical and Bilaterall

Lab #7: Introduction to the Kingdom Animalia Objectives: 1 ...

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