Exam Tips Flashcards
(8 cards)
If it asks for a plant do not start naming parts of that same plant eg willow bark just say willow
Control variable and control are different
Control-standard of comparison
Control variable- what u keep the same
Equations-caridac outpur-stroke volumex heart rate
Percentage increase in mass- increase in mass/starting mass x 100
Percentage mass decrease- decrease in mass /starting (intial mass) x100
Percentage change-(final value-initial value) / initial value x 100 (positive answer increase negative answer decrease
Turn hours into mins divide that answer by how many mins it takes ro divide once
That will gice u number of divisions
Do 2 to the power of that divisom number.
Number of times bacteria, divide in a set amount of time
Nukber of bacteriax 2^ number of divisom=how fast bacteria fvides
Comparison- thickER,smallER,narrowER,
Osmosis-dilute (high concentration of water) concentrated (low concentration of water)
MUST SAY HUGHER CONCENTRATION FO WATER
LOWER CONCENTRATION OF WATER
So u either day dilute to concentration or the other way round
Units
Centimetres x10 = millimetres (mm)
Millimetres x1000=micrometers (um)
Micrometers x1000=nanometres (nm)
Millimetres /10=centimetres (cm)
Micrometers /1000=millimetres (mm)
Nanometres /1000= micrometers (um
Enzyme practical- amylase-pH
Add drops of iodine into spotting tile
Mix together ph buffer,starch and amylase
Start stop watch imeedietley
Use pippette to rekove drop of solution every min
Put ij iondine
If strach roesent colour chnage in iodine black
Repeat whole method for other ph
Compare time taken for iodine to stay brown
Required practical for photosynthesis
Verify the relationship between light intensity and rate of photosynthesis
Independent-distance between plant and light source
Dependent -rate of photosynthesis (indicated by oxygen produced)
Add pondweed to test tube, add sodium hydrogen carbonate (provides co2) cut stem at angle, wile submerges. Invert and pit in, beaker interim no sit st top.
Doing darkroom
place lamo at set distance. After minute (to let ps stay constant) count bubbles or volume of oxygen produced
Change distancee and draw graph (inverse curve)
