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31 Cards in this Set
- Front
- Back
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Magnification |
size of drawing (mm) / size of specimen (mm) |
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Actual Size |
Image Size / Magnification |
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Test For Sugars
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Take equal samples for comparison • Crush the sample (if it’s needed) or extract with water • Add Benedict’s Solution • Heat (not warming) with a water bath • Same time of Boiling for comparison • The colour changes blue to green to yellow to orange to red • Or it remains blue if there is no reducing sugars (negative result) |
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Test for starch |
Crush the sample (if it’s needed) or extract with water • Add drops of iodine • Observe colour change brown to blue-black |
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Test for proteins |
* Add a measured volume of Biuret solution * In a test tube or a beaker * Colour changes from blue to purple |
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Test for fats |
Add a measured volume of ethanol to the sample Add an equal volume of water to the mixture A white emulsion forms which is a sign of |
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Test of Oxygen |
Relights a glowing splint |
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Test of Hydrogen |
Ignites with a burning 'pop' sound |
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Test of Carbon Dioxide |
Bubble gas in limewater Limewater turns milky white Carbon dioxide is an acidic gas, it lowers the pH |
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Test for ammonia |
Turns damp red litmus paper blue |
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Test for chlorine |
Bleaches litmus paper |
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Test for water |
Use (anhydrous) cobalt (2) chloride paper - turns blue to pink Test (liquid) boiling point/ freezingpoint for water; Impure water has a lower MP and a higher BP |
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Ice Water temperature? |
0 degrees Celsius |
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Room Temperature? |
22 to 25 degrees Celsius |
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Hot Water temperature? |
60 degrees Celsius |
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In what conditions does lipase works best in? |
Lipase works best in alkaline conditions / provides suitable pH for lipase ; |
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Why are two beakers left alone for 5 minutes? |
So that both tubes reach the experimental temperature |
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When milk breaks down it is .... |
-Acidified since it breaks down to glycerol and fatty acids |
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Glucose breaks down to... |
-Reducing sugars like glucose |
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Diffusion |
The net movement ofmolecules from a region of their higherconcentration to a region of their lowerconcentration down a concentration gradient, asa result of their random movement |
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Osmosis |
The diffusion of watermolecules from a region of their higherconcentration (dilute solution) to a region of theirlower concentration (concentrated solution),through a partially permeable membrane |
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Active Transport |
Movement of ionsin or out of a cell through the cell membrane,from a region of their lower concentration to aregion of their higher concentration against aconcentration gradient, using energy releasedduring respiration |
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Potato tuber |
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Flower parts |
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Tuber and flower type of production? |
Tuber - asexual reproduction Flower-sexual reproduction |
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How to show the formation of starch in a green plant? |
-Destarch a plant/put in dark/cover with paper or foil -Test for starch; [no details required for this mark} -Expose leaf to light and test for starch AGAIN -Use alcohol before adding iodine (solution}; brown to blue-black. |
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What is agar jelly for... |
Produces all the nutrients necessary for a bacterium |
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Hydrogencarbonate indicator is used... |
To show carbon dioxide concentration in solution. -Highest: Yellow -Higher: Orange -Atmospheric level: Red -Low: Magenta -Lowest: Purple |
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What is required to emulsify / break down large fat droplets to smaller droplets? |
Bile |
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Teeth |
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Petiole and midrib? |
-leaf branch -middle leaf |
