ls final study guide

ls final study guide - 1 LS1 Final Study Questions...

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1 LS1 Final Study Questions Study Questions 1.What morphological traits indicate that choanoflagellates are related to sponges? - multicellular - genetics, rRNA - Epithelial tissue 2. What is the difference between diploblasty and triploblasty? Which animal groups are diploblastic? - Diploblasts are animals whose embryos have two types of tissues or germ layers : the ectoderm (“outside skin”) and endoderm (“inside skin”). Sponges and Ctnephores are diploblastic - Triploblasts are animals whose embryos have three types of tissues: the ectoderm, endoderm, and mesoderm (“middle skin”). These germ layers develop into distinct adult tissues and organs. 3. Why is bilateral symmetry considered an important adaptive step in animal evolution? - Bilateral symmetry permits streamlining, favors the formation of a central nerve center, contributes to cephalization, and promotes actively moving organisms. Bilateral symmetry is an aspect of both chordates and vertebrates. 4. Identify which of the following materials are denser than water:  Muscle , fat,  bone, insect exoskeleton,   mullosk shell , oil. 5. Describe two strategies that animals can use to make themselves buoyant. Describe and an example of each. -Falling – float arounds… ie pollen -Jet propulsion – release fluid to get thrust… ie some marine animals 6. Describe three strategies that animals can use to fall more slowly. Describe an example of each. -VELOCITY increases/ falls rapidly when SIZE increases, DENSITY increases and VISCOSITY decreases -VELOCITY decreases/ falls more slowly when SIZE decreases, DENSITY decreases and VISCOSITY increases 7. In the stokes equation, what three important parameters determine how fast an object sinks? - SIZE x DENSITY VISCOSITY
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2 8. Can organisms be buoyant in air? Why or why not? -It cant be naturally buoyant but some can “float”. This depends on the living things’ size, density an viscosity 9. Why is filter/suspension feeding more common in the water than on land? -Because most food is located in the water, the marine animals suck water to obtain food. 10. Describe filter feeding in the following taxa: sponges, tunicates, bivalves, bryozoans,
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This note was uploaded on 04/22/2011 for the course LS 1 taught by Professor Thomas during the Fall '05 term at UCLA.

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ls final study guide - 1 LS1 Final Study Questions...

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