required practicals-bio

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required practicals:

required practical 1- magnification

magnification=image size/actual object size

required practical 2-omosis (potato skin)

a

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required practicals-explain:method, control variables, independant variable

required practical 1-magnification

maginification=image size divided by actual size

practical 2-osmosis (potato skin)

always a percentage question

high concentration of water to low concentration of water

question can include graph drawing

practical 3-food tests

starch=idodine solution-turns blue/black

protein=burets solution-turns purple

fats=ethanol-turns cloudy/milky

sugar=benedicts/sudan 3-brick red

practical 4-enzyme activity

testing for the optimum pH that an enzyme will operate at-37 degrees, water bath controls temperature

practical 5-photosynthesis (measuring the effects of light on a piece of pondweed in a beaker full of water and measuring the amount of oxygen produced)

light intensity-independant variable

rate of photosynthesis (what we measure)-dependant variable

practical 6-petri dish (main triple only)

agar jelly (nutrient)-infected with ecoli then various anti biotics and anti septics are added to determine wether they can defend against ecoli, or have any effect on it