Questions #13-#19 are short answer type questions. 13. What substance was used a
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Questions #13-#19 are short answer type questions. 13. What substance was used as a control in the lob? 14. Explain the purpose of a control in the lab 15. Describe the test for fat that was used in the lab. 16. Name a function of fat in the body. 17. Name an example of a protein found in the body 18. A student adds Benedict's to egg white and waits for a color change.How long will the student wait? Why? 19. What is the function of starch in plants? 20. What substance was used in the lab as an emulsifier?Explanation / Answer
13. A control is something that have all the conditions same except one which you are studying.
For example, you are seeing the effect of phosphate on a plant. In this case you will select two plants, both will be given all conditions same such as temperature, sunlight but one of them will be given phosphate and other will not. The later will be your control.
14. The purpose of using a control is that there is something you can compare your results to. It ensures whatever different results your test is showing owes to variable only and not to any other variables.
15. The presence of fat can be checked by - mix the sample in water, leave it for sometime and if there is fat in the sample, it will seperate into two layers, fat be the upper layer as it is denser. Also you can mix the sample in ethanol and diisolve it to get a clear solution. Then, add this sample to water and if the fat is present you will get a milky solution like result.
16. Fats are important for providing energy.
17. Keratin is a protein found in hair.
18. benedicts gives positive result for the reducing sugar. it hardly a chance that result will come.
19. Starch is the storage form of energy in plants.
20. washing up liquid or egg yolk can be used as emulsifier.
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