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close this bookBiology Demonstration Manual (Peace Corps, 1993, 35 p.)
View the document(introduction...)
View the documentForeword
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View the documentClassification of living organisms
View the documentThe food chain game
View the documentGrowing peanuts
View the documentRoots
View the documentRoot hairs
View the documentVascular bundles
View the documentPresence of minerals in soil
View the documentNecessity of sunlight
View the documentTransport of water in plants
View the documentTranspiration
View the documentPresence of starch in leaves
View the documentPollination
View the documentSeed dissemination
View the documentSeed structure
View the documentCotyledons
View the documentNecessity of water for germination
View the documentRainfall on leaves
View the documentGrowth curve of a plant
View the documentGrafting
View the documentImportance of ground cover
View the documentCell-tissue-organ-system-organism
View the documentLength of the small intestine
View the documentEnzymes
View the documentThe three food groups
View the documentThree food groups homework
View the documentCarnivore and herbivore teeth
View the documentThe food chain game
View the documentLong capacity
View the documentModel lung
View the documentBlood circulation
View the documentHow physical activity affects heart and breathing rates
View the documentLocomotion
View the documentAntagonistic muscles
View the documentSuction
View the documentFern reproduction
View the documentMoss preservation
View the documentAre yeast living organisms?
View the documentYeast
View the documentYeast budding
View the documentNitrogen fixing nodules
View the documentAmoeba
View the documentBursting red blood cells
View the documentLength of a ténia
View the documentModel of a schistosome
View the documentAdaptations
View the documentMountain formation
View the documentArtesian well
View the documentBone structure
View the documentReflexes
View the documentTest for glucose
View the documentTest for starch
View the documentTest for fats
View the documentTest for proteins
View the documentCooling effect of sweat
Open this folder and view contentsMICROSCOPE PREPARATIONS

Are yeast living organisms?

Class: 5.

Lesson: Les levures

Rationale:

1. Demonstrate that yeast respires.
2. Use to demonstrate the scientific method.

Materials:

yeast

From the science kit:

sugar

lid of science kit

warm water

2 stands

bowl

2 clamps

water

metal test tube

plastic lid (for inverting)

holed stopper

stirring rod

3 inch plastic tube

matches

graduated cylinder


hose

Procedure:

1. The water mixed with the yeast needs to be warmed to finish this experiment in 5 minutes instead of 2 hours. To take warm water to school, boil water before leaving for school. Pour into a jar and wrap the jar in a towel. The water will stay adequately warm for at least four hours.

2. Mount the two stands and clamps on the lid of the science kit.

3. In the metal test tube, add 1 tsp of yeast and 1 tsp of sugar. Fill the test tube halfway with warm water and mix

4. Insert the 3 in plastic tube in the stopper.

5. Close the tube with the holed stopper.

6. Mount the test tube in one clamp.

7. Fill the graduated cylinder with water. Invert it in a bowl of water and mount it in the second clamp.

8. Attach the hose to the test tube and insert the other end of the hose in the graduated cylinder.


Test tube

9. Almost immediately the gas will begin collecting in the graduated cylinder.

10. After the graduated cylinder is full of gas (>5 min), use a lighted match to show that the gas is carbon dioxide.

Source: HBJ Concepts in Science Orange, p. 232 with modifications by C. Huss.