A2 Biology Unit 6 ~ 16th May 2012

for preliminary :-
-practice the method beforehand to actually see if it will work or not
-write the independent variables which can affect the dependant variable
-state how you wil control them
-find out favourable conditions for the experiment and try to impose them in the actual experiment
-select a suitable timescale to measure the dependant variable.
(NOTE ive written dependant variable ....in the real exam replace it with the dependant variable ASKED IN THE EXAM eg:- number of egg hatched , human height etc....)

then theres always a question on ethical issues and safety :-

-(if about animal) top notch veterinary services cannot be provided
- do not put too much stress or it may die
- relocate to natural environment soon after the experiment is over
- keep lab conditions hygeinic

-(if about plants) wear gloves
- careful of insect biting
- do not tamper with other plants
- try not to stamp on other plants
- plants may be poisonous

and safety:-
- wear gloves
-wear goggles
-clean benches with ethanol
- flame necks of bottles to avoid air borne contamination
- possible chances of bacterial infection
- some people maybe allergic to certain chemicals used during the experiment.

......................for the 10 mark question basically write WHATEVER you can think of , its 2 pages , fill them completely !!!!!!

limitations :-

- not possible to control all factors affecting dependent variable
- conditions in lab may differ from conditions in the natural environment
- (then become specific) eg :- cloud shade affecting sunlight reaching earth , not placing the cotton wool in same place between eye stalks , not able to keep temperature constant , impossible to control genetic variations in seeds and organisms , difficulty in counting all the eggs through the microscope ....etc etc etc !!!

HOPE THIS HELPS ...!

Hey does any 1 know which Core Practical came up in this year's Bio unit 3????.....at least we can keep that core practical out of our predictions for unit 6......

Hey does any 1 know which Core Practical came up in this year's Bio unit 3????.....at least we can keep that core practical out of our predictions for unit 6......

Guys does any of u know what variables to control in gel electrophoresis and the effect on the dependent variable if those variables are not controlled?

well , i dont even know that dependent and independent variables of that experiment..!!

Aren't u the one which posted this:

if gel electrophoresis comes what will be the dependant and independant variables ..?!

i reckon :-
dependant :- distance travelled by DNA fragments
independant :- size of the DNA fragment

what to do you guys think ?

it was Daphnia !! not gonna come nowww !!!

For January 2012 unit 3 vitamin C came.
For January 2012 unit 6 respirometer.

Oh **** i kept that in my predictions for this year...so what now???? u have ne prediction of core practical that might come from AS??

can someone tell me what are the dependent and independent variables of the respirometer experiment please??

what would be dependent and independent variables for mitosis experiment ?!

dependent :- number of chromosomes visible
independent :- concentration of orcein ethanoic stain .....

WHAT >>?!!

U ARE A NERD......

ok in the question where they ask how will we analyse display the data...bla bla

do we actually DRAW A TABLE ..?!
if yes , then what values do we put in ..? ...cuz in those questions no values are given , do we make them on our own ?...or do we just draw a table with columns and headings and dont write any value ..?!

so u have ne suggestions what might come this year's 6b????

Any of the practicals may come accept the ones which came already

Btw r u a Real Madrid fan?