Chapter 21 Resource: Ecology

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Name Date ClassHands-On ActivitiesCalculating Population DensityProcedure1. Calculate the total area of your home by multiplying the length times thewidth of each room and adding all the products together.2. Count the number of people who live in your home.3. Divide the number of people living in your home by the total area to determinethe population density.AnalysisCalculate what would happen to the population density if the number of people living in yourhome doubled?Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.4 <strong>Ecology</strong>
Name Date ClassEcosystem in a BottleLab PreviewDirections: Answer these questions before you begin the Lab.1. What will you put in the plastic bottle?Hands-On Activities2. At what level should you keep the water? What kind of water should you use to replace waterthat evaporates?You may think of ecosystems as large areas. But ecosystems can be any size.You can even make an ecosystem that fits in a plastic bottle.Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.Real-World QuestionWhat are the parts of an ecosystem?Goals■ Model an ecosystem.■ Observe an ecosystem.Materials2-L bottlescissorssandaquarium gravelmetric rulerwaterElodea plantsguppyfish foodSafety PrecautionsProcedure1. Rinse out a 2-L plastic bottle with water.Using scissors, carefully cut off the top ofthe bottle.2. Pour a layer of sand 5 to 10 cm deep in thebottom of the bottle.3. Fill the bottle to within 5 cm of the topwith water that has stood in an open containerfor about two days. Keep a supply ofthis aged water on hand to replace thewater that evaporates from the bottle. Thelevel should always be about the same.4. Plant the Elodea and add a 2-cm layer ofgravel. Place the container in bright lightbut not direct sunlight.5. When the water clears, add a guppy.6. Feed the fish one or two small flakes offood every day.7. Observe your ecosystem every day andrecord your observations in the table inthe Data and Observations section. Be sureto include observations about the livingand nonliving parts of your ecosystem.<strong>Ecology</strong> 5
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Chapter 21 Resource: Ecology

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