BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )

[XYZ91]

wat would be the control for the NaCl thingy?..would you say to heat the enzyme above 80 degrees to show that effect of enzyme will not work?

If you're asked to provide a Control for the addition of NaCl specifically, I don't think you can bring in temperature ... For the Control, the only variable that you CAN change is the variable you're invesitigating the effect of; in this case, NaCl. Temperature has to stay the same.

[Jalwardi]

PPL there is nothing like NaCl .. :S

[XYZ91]

What will the source of error be?

If it there really is usage of NaCl, I suppose you could say, pH was not maintained. Also, if there's no temperature control, you could mention that, as well.

Parallex error when reading the volume of CO2 produced if a syringe is, in fact, used to take the measurment and there's no counting of bubbles. If you do have to count bubbles, you could say there's a chance that an error could've arisen there.

[XYZ91]

PPL there is nothing like NaCl .. :S

Consider all possibilities; you never know.

[Jalwardi]

DUDe this is a bio practical not a chemistry i assure u there is nothing like that if there was some thing like this the ppl who didi p31 will get it ,, trust me on this,, CIE ppl will never have major changes in pappers like this .. its just simple changes in the paper

PPL there is nothing like NaCl .. :S

Consider all possibilities; you never know.

[XYZ91]

DUDe this is a bio practical not a chemistry i assure u there is nothing like that if there was some thing like this the ppl who didi p31 will get it ,, trust me on this,, CIE ppl will never have major changes in pappers like this .. its just simple changes in the paper

PPL there is nothing like NaCl .. :S

Consider all possibilities; you never know.

Frankly, NaCl or no NaCl, I don't care. Examfreak had a question; I answered it, hypothetically.

Some teachers are of the opinion that NaCl might be a part of it, so ...

[Jalwardi]

fine .,,,,

DUDe this is a bio practical not a chemistry i assure u there is nothing like that if there was some thing like this the ppl who didi p31 will get it ,, trust me on this,, CIE ppl will never have major changes in pappers like this .. its just simple changes in the paper

PPL there is nothing like NaCl .. :S

Consider all possibilities; you never know.

Frankly, NaCl or no NaCl, I don't care. Examfreak had a question; I answered it, hypothetically.

Some teachers are of the opinion that NaCl might be a part of it, so ...

[LupeFiasco]

So frankly,  does anybody in here had actually done the paper ? enuf of assumptions fellas, we need exactly what's gonna come. Just the questions would help a LOT! peace out. 

[Jalwardi]

im doing the paper after 2 hours ..

[LupeFiasco]

Anyone who has done it, post the questions please. Thanks anyways.

If anybody needs help in micrometer calibration, full explanation here:

http://www.microscopeworld.com/MSWorld/calibration.aspx

[hacker911]

hey.........
NaCl effect on yeast suspension(u hav to cut a plastic pipette for this).....
transverse leaf slide.......
Best o Luck....

[XYZ91]

What was everybody's value for area of field of view?

[musicfreak]

i remember getting 159 stomata! did anyone else get that??

[XYZ91]

i remember getting 159 stomata! did anyone else get that??

I think there were 28.

[pikutata]

whats the radius? is it 3x100micrometers . then u divided it by 2? i beliv u get 150micrometer? change it to mm.