IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: TheDevilOwns on May 16, 2009, 09:43:46 am

Title: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: TheDevilOwns on May 16, 2009, 09:43:46 am: PLEASE ANYONE HAS ANY INFO ABT BIO P32???
just to make u guyz feel better i think i have a chance to get some info frm this teacher i know.
but for now anyone knowz anything .. lets share.. and p31 was abt da yeast experiment thingy...
so if anyone has any idea abt 32 [/b] SHARE IT HERE

~THEDEVILOWNS~
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: TheDevilOwns on May 16, 2009, 10:11:00 am: WE NEED HELP HERE ~_~
guyz reply but with the correct info please.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: TheDevilOwns on May 17, 2009, 01:32:20 pm: GUYZ ANYONE??? PLEASE HELP!!
[/u][/color]
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: shamanking on May 17, 2009, 11:55:58 pm: ma teacher tol me tht for the slides read about the leaf structure
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: TheDevilOwns on May 18, 2009, 06:53:46 pm: give some more info if u get updates!!!
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: TheDevilOwns on May 23, 2009, 11:36:58 pm: I PROMISE THAT ILL GET THE INSTRUCTION AFTER TWO DAYS!!!
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: GreenGarden on May 24, 2009, 06:00:39 am: my lecturer said there are yeast and starch..tat's all i noe...[/color]
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on May 31, 2009, 08:15:44 am: anything else??? pls share more..
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: franklin_smith on May 31, 2009, 03:23:08 pm: Devilsown,

Did your teacher give you any tips? Can you share it here? Thanks
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on May 31, 2009, 08:09:39 pm: plz plz can anyone tell us wat is comin in that damn exam because i will fail without any help plz me exam is tomorrow plz give some info. :'(
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: GreenGarden on May 31, 2009, 08:42:43 pm: i wonder for slides label..do u guys normally write in pencil or pen?and for stage micrometer..isit fixed tat 1 dvs is always 0.1mm.?.because my lecturer told us tat ours is 0.01mm
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on June 01, 2009, 07:38:19 am: few years back past year papers stated the size of smallest division on the question papers. and i found that they are usually using the scale- 0.1mm for smallest division. but of course it all depends in the question paper tml~
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: donvader123 on June 01, 2009, 08:10:56 am: smallest is 0.1mm..that im kinda sure
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: adkhan on June 01, 2009, 09:40:22 am: sorry a mistae on my behalf the salt increases the ph trying to neutralise due to the acidic CO2
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 09:45:53 am: thanx a lot...!!! anyone else knows anything??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: adkhan on June 01, 2009, 10:07:26 am: hey if u guys want u can take a look at this plan diagram ive attached, our teacher made us draw it today, the diagram is drawn neatly but please excuse my handwriting :S

Cheers, ADKhan
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 10:12:06 am: thank youu once again!!!
im gonna practise doing this den! :D
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: adkhan on June 01, 2009, 10:32:48 am: sorry mate thts how ive been told to do it, so i think im gonna stick to it, but can u actually elaborate on how u think it shud be done?
itll be much appreciated :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: adkhan on June 01, 2009, 11:02:52 am: because as far as i have been told a PLAN DIAGRAM of a CELL consists of all of its layers and different cells wiothout their internal organelles, can u please tell me how it has been described to you?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 11:11:51 am: well as what i know from what my teacher told me and shes an awsum teacher... a plan diagram shud only be lines...no cells shud b drawn...
so for like a plan diagram for the similar drawing u posted ..it wud luk summin like
_______________________________
_______________________________ the first small layer is for the upper epidermis

   the 2nd layer after that for the palisade mesophyll
_______________________________
   the 3rd layer for spongy
   4th for the lower epidermis...the width of the layer shud b that of similar ratio to the one in the
   diagram... no cell drawing AND no shading..i lost mark in my mock for shading too... just outlines
   if dey specify draw cells...den draw the cell but make no shading of nucleus etc..
_______________________________
_______________________________
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 11:33:04 am: yea k..ma badd... dint notice that... thanxx
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: GreenGarden on June 01, 2009, 11:38:04 am: i don think from the point of veiw tat they actually neutralise..for me they act as inhibitor..think abt this ..if it function to neutralise.and we r using diff concentration of NaCl then the exp doesnt really show the activity of the yeast isn't it..
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: adkhan on June 01, 2009, 11:48:03 am: to be honest i dint understand the plan diagram and the nacl portion either, but this teacher of mine is known to have leaked papers soooooo many times that i think itll be wise for me to just follow his instructions, i think tht the nacl will inhibit oo but wtevr
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 12:03:05 pm: well it cud also mean the affect of ph on the enzyme and den testing the rate of rxn...like adding diff conc. of nacl to change the ph and keeping all oder variables like temp.. the conc of enzyme substrate etc... and den cheking the no of bubbles produced with each conc. of nacl..
im just guessing... i donno myself...
anyone else knows anything bout the p 32 bio and cud confirm??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on June 01, 2009, 12:25:17 pm: but from what i read is nacl is one of the fermentory substrate/nutrients for yeasts. so either way is possible tho...but i have doubt on the pipette and syringe thingy..
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 12:28:41 pm: well i think dey will tell us what the role of nacl is as we all donno..or if not we can guess it out when we r doing the expt... plus we actually dint measure the volume but counted the no of bubbles produced...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on June 01, 2009, 12:30:08 pm: meaning the syringe thingy is just for measuring the amount of yeast we want?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: adkhan on June 01, 2009, 01:34:53 pm: ahh, i called my tecacher found out the role of nacl, he gave me a link to this passage for bettr understanding

yeast fermentation is retarded in the presence of high concentrations of sugar and salt. This inhibitory effect is related to the high osmotic pressure gradient created outside of the yeast cells due to high concentrations of sugar and/or salt.

Salt also inhibits yeast activity if it is used at levels above 1% in the mixture.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 01:54:09 pm: is that about paper 31 or 32 if 32 may u plz give info about bio paper 31 plz
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: GreenGarden on June 01, 2009, 01:55:47 pm: yeast activity hav to be maintained at around 35 oC , so we need a water bath..well, i nvr try this kind of experiment b4 where we hav to prepare our own water bath.we normally use the machine kind ,already prepared .can any1 tell me how to do this ..heat the water once the temp reach around 35, takeaway bunsen burner then temp fall heat it again?i'm totally confused..
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lhl_anecar on June 01, 2009, 02:29:09 pm: can someone please elaborate on how to count the size of the organelle through the microscope?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 02:52:34 pm: plz
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 01, 2009, 02:53:26 pm: any idea which country will take the exam 1st? lets hope someone will do the exam 1st and post the questions here, my paper starts in like 10hours...its 11pm now, my paper starts 8am. imma gonna stay whole night studying and waiting for some hints and tips here. sleep can wait, after the paper.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: LupeFiasco on June 01, 2009, 02:59:22 pm: Quote from: pikutata on June 01, 2009, 02:53:26 pm
any idea which country will take the exam 1st? lets hope someone will do the exam 1st and post the questions here, my paper starts in like 10hours...its 11pm now, my paper starts 8am. imma gonna stay whole night studying and waiting for some hints and tips here. sleep can wait, after the paper.

Oi, good luck. I bet those who have already don't it r f***** sleepin.......i was beggin for P4 bio and they gave it 10 min before my exam finished. peace out.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 03:01:09 pm: any idea about bio 31 plz
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 01, 2009, 03:03:48 pm: Oi, good luck. I bet those who have already don't it r f***** sleepin.......i was beggin for P4 bio and they gave it 10 min before my exam finished. peace out.
[/quote]

yeah man, thanks.. ^^, when's ur paper?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: LupeFiasco on June 01, 2009, 03:09:43 pm: Quote from: pikutata on June 01, 2009, 03:03:48 pm

Oi, good luck. I bet those who have already don't it r f***** sleepin.......i was beggin for P4 bio and they gave it 10 min before my exam finished. peace out.

yeah man, thanks.. ^^, when's ur paper?
[/quote]

16 more damn hours........and i gotta bust a nut learning physics P4 and chem P4.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 03:27:13 pm: come on guyz
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 01, 2009, 03:32:37 pm: i'm still waiting...

~busy drawing pictures of Arteries, Veins, capillaries, trachea, bronchioles, alveolus, leaves, stems, roots...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 05:28:21 pm: yea, as far as i know...monocot leaf will come and the question will be to draw a plan diagram of the transverse section...........or it will be of a xeropyte and it'll ask to draw stuff abt its structure n reasons for it...anyways i'll let u ppl know abt anything new i find abt this paper... :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 01, 2009, 05:29:55 pm: Quote from: hacker911 on June 01, 2009, 05:28:21 pm
yea, as far as i know...monocot leaf will come and the question will be to draw a plan diagram of the transverse section...........or it will be of a xeropyte and it'll ask to draw stuff abt its structure n reasons for it...anyways i'll let u ppl know abt anything new i find abt this paper... :)

alright.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 01, 2009, 05:45:17 pm: are u people talking abt p32 or 31?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 05:57:09 pm: paper 31 plz hints or question if u have :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 06:06:23 pm: paper 31 wayyy over
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 01, 2009, 06:07:11 pm: any more tips? paper32.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 01, 2009, 06:11:04 pm: is there any difference between the transverese section of a dicot and a monocot?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 01, 2009, 06:13:53 pm: Quote from: examfreak on June 01, 2009, 06:11:04 pm
is there any difference between the transverese section of a dicot and a monocot?

monocot leaf:(http://www.ucmp.berkeley.edu/IB181/VPL/Ana/AnaP/Ana22l.jpeg)
dicot:(http://www.ucmp.berkeley.edu/IB181/VPL/Ana/AnaP/Ana23l.jpeg)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 06:22:45 pm: mono cot has gaurd cells on both upper and lowe epidermis
but diocot only hs on the lower epidermis
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: blablabla17 on June 01, 2009, 06:29:49 pm: hey...if it's a plan diagram...can we draw the stomata?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 06:30:39 pm: NaCl with yeast mite come.....iv bin gettin info from many ppl sayin its gonna come........Yeast produces CO2 (which reduces PH) by respiration.......NaCl disrupts the osmotic balance and reduces yeast growth....thus less CO2 wiull be produced and PH drop will be less.............the question mite tel us to test different concentrations of NaCl and record the number of bubbles in a specific time and the PH drop at every concentration......it mite ask to draw a graph and put forward a conclusion....
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 06:39:35 pm: By reason for xerophytes i meant that it could ask abt the visible adaptations for low transpiration in the slide and the reasons how its slows water loss...........

PLAN DIAGRAMS ONLY HAVE LINES TO SHOW DIFFERENT TISSUES....U CANNOT AND SHOULD NOT DRAW GUARD CELLS.....however, i usually leave blank spaces in lines to show presence of stomata.........here in monocots...stoma'll b present on both upper n lower surfaces....

Yea....concentration of NaCl increase......PH drop decreases......and number of bubbles decreases.....but watch out for it in the practical....
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: blablabla17 on June 01, 2009, 06:46:09 pm: shyt...

wrong...

i dunno how to use the line to draw...

any one help please...

draw out a plan diagram with guard cell on both epidermis please...

thanks
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: bottlerockets on June 01, 2009, 06:47:06 pm: Quote from: blablabla17 on June 01, 2009, 06:44:49 pm
Quote from: hacker911 on June 01, 2009, 06:39:35 pm
By reason for xerophytes i meant that it could ask abt the visible adaptations for low transpiration in the slide and the reasons how its slows water loss...........

PLAN DIAGRAMS ONLY HAVE LINES TO SHOW DIFFERENT TISSUES....U CANNOT AND SHOULD NOT DRAW GUARD CELLS.....however, i usually leave blank spaces in lines to show presence of stomata.........here in monocots...stoma'll b present on both upper n lower surfaces....

Yea....concentration of NaCl increase......PH drop decreases......and number of bubbles decreases.....but watch out for it in the practical....

ok thanks...
\

is it something like this?

Woah. SO many lines. :o
I don't think you need to incorporate so many lines into your plan drawing, if you'll look back, someone has drawn the lines for it, I think that person was right.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 06:48:03 pm: L0l yea....sumthin like dat........just take it easy on the lines.....

__________________ _______________ ______________ ________________
_________________________________________________________________

_________________________________________________________________

_________________________________________________________________
_________________________________________________________________
__________ ________________ _________ ___________ ________________
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: blablabla17 on June 01, 2009, 06:49:45 pm: not i want to draw so many lines...

it's i dunno how to use the line here to draw...

LOL...

anyway...

the one he drew...does nt have guard cell...

i want to include guard cell like what harker said...
you can put spaces in between to show guard cells present...

anyone wanna show how to draw?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: blablabla17 on June 01, 2009, 06:51:06 pm: Quote from: hacker911 on June 01, 2009, 06:48:03 pm
L0l yea....sumthin like dat........just take it easy on the lines.....

__________________ _______________ ______________ ________________
_________________________________________________________________

_________________________________________________________________

_________________________________________________________________
_________________________________________________________________
__________ ________________ _________ ___________ ________________

why urs doesnt have cuticle layer on top?

and why is there another extra layer after the spongy and before the lower epi?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: blablabla17 on June 01, 2009, 06:58:11 pm: hacker...

can we draw the vascular bundle as a circle...

to show it's present?

but no the individual cells in it...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 07:01:03 pm: umm...i jus misplaced the layers........

__________________________________________________ cuticle
________ _____________ __________ _________________
   Upper epidermis
__________________________________________________

   Palisade

__________________________________________________

   Spongy

___________________________________________________
   Lower epidermis
______ _________ ___________ __________ ____________
___________________________________________________ Cuticle...........

Is this rite.... :P
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: bottlerockets on June 01, 2009, 07:02:42 pm: Quote from: hacker911 on June 01, 2009, 07:01:03 pm
umm...i jus misplaced the layers........

__________________________________________________ cuticle
________ _____________ __________ _________________
   Upper epidermis
__________________________________________________

   Palisade

__________________________________________________

   Spongy

___________________________________________________
   Lower epidermis
______ _________ ___________ __________ ____________
___________________________________________________ Cuticle...........

Is this rite.... :P

Yeah, this is right. I mean, this is how you draw a plan diagram.
But how do you show the stomatal pore? Or will that be a separate part to the question?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 07:06:12 pm: @ bottlerockets..................presence of stomatal pores imply absence of lower epidermis........so i usually leave spaces in the epidermis...u cant draw guard cells because its not a tissue....

@ blablabla........................yea, u hav to draw vascular bundles where required as circles.....not perfect circles but u have to make three or four portions of it.....namely....xylem, cambium, phloem n then sclerenchyma(if present)...hope it helps... :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: bottlerockets on June 01, 2009, 07:09:10 pm: Quote from: hacker911 on June 01, 2009, 07:06:12 pm
@ bottlerockets..................presence of stomatal pores imply absence of lower epidermis........so i usually leave spaces in the epidermis...u cant draw guard cells because its not a tissue....

Okay, I'm confused now.
If the presence of stomatal pores indicates an absence of lower epidermis, than why did you draw the lower epidermis in your plan drawing?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 07:12:03 pm: stomata dont occupy all the length of the section they are just present at places within the lower epidermis....u mite like to check this chapter up in some good book....wil help u loadz...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: bottlerockets on June 01, 2009, 07:13:05 pm: Quote from: hacker911 on June 01, 2009, 07:12:03 pm
stomata dont occupy all the length of the section they are just present at places within the lower epidermis....u mite like to check this chapter up in some good book....wil help u loadz...

Thank you so much, I will do that :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 07:28:12 pm: people this year there is no calibration my teacher told me so + their will be a new ocular other than the previous years ..
plus for plan digram it must not be like this .. as the name its just the plan so no cells must be shown..
and thanks all of you for the information
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 07:29:31 pm: more tips plz
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 07:31:46 pm: GOOD LUCK EVERYONE>.......................
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 07:45:26 pm: plz more hints on bio 32 as soon as possible exam in 3 hours plz
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 01, 2009, 07:56:57 pm: remember........NO SHADING !!
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 01, 2009, 08:00:44 pm: Hey contagioius......can u pls post wat came in the paper..........iv got exam in 7 hours.....pls....
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 08:19:05 pm: i got more than 7 hours for the exam so please who ever rights the exam post what came ..
please atleast give us hints on what will be going .. =D thanks
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: gurl on June 01, 2009, 08:26:20 pm: hey....we hav 2 get da slides focused ourselves yea?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 08:27:59 pm: yes sure .. the slide will be given and u have to do everything ..
when is ur exaam .. how many hours left ??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: gurl on June 01, 2009, 08:30:59 pm: oh k Thanks...because our teachrs used 2 set it 4 us all da time...thts y i wasnt sure...

neways i gt lik 10.5 hrs mor 4 my paper... ;D

pls do post if u guys kno wt exctly is gonna come...

Thanks!! :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 08:33:19 pm: same here 10.5 hours ..
By the way from where are u ??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: gurl on June 01, 2009, 08:36:19 pm: in saudi...hw about u?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 08:38:46 pm: Bahrain =D niic meeting u =D
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: gurl on June 01, 2009, 08:40:24 pm: cool! nice meetin u 2...!! :D :)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: contagious on June 01, 2009, 08:44:44 pm: hacker 911 dont forget to post wat came in the exam ok dude
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: little.butterfly.girl on June 01, 2009, 10:24:49 pm: Quote from: blablabla17 on June 01, 2009, 06:29:49 pm
hey...if it's a plan diagram...can we draw the stomata?

u can indicate on the diagram its place like:
_______ ______
_______l l______
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: shamanking on June 01, 2009, 10:41:22 pm: Study about the hydrophytiv leaf
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 01, 2009, 11:14:22 pm: why are stoma located in the upper epidermis only of a hydrophytic leaf?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 11:19:11 pm: what is a hydrophotic leaf exactly ..
i hear xerophytes but not hydrophotic .. :S ???
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 01, 2009, 11:21:31 pm: plants that live in water !
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 01, 2009, 11:26:55 pm: aw okaaay .. i think our teacher gaves us a completely diff name for them cant remember wt exactly
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 01, 2009, 11:47:00 pm: okay quick may be stupid question, do u really think that these are the questions that we'll be asked about? i mean so i shudn't bother myself with studying food tests and stuff? im pretty sure we are takin' the p32..
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 02, 2009, 12:05:47 am: 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?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: blablabla17 on June 02, 2009, 12:07:15 am: all the best guys...

well

my exam start like in 1.5 hours...

but i got 2 hours of exam and 2 hours of quarantine...
that sucks man...
because my college got 2 shift...

i am in the 1st so need quarantine to prevent leakage...

may the power be with you

all the best guys,...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: shamanking on June 02, 2009, 12:08:58 am: What will the source of error be?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 02, 2009, 12:10:14 am: i think that u cud say that the bubbles are of different sizes... u no bubbles of gas...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 02, 2009, 12:12:13 am: or that the apparatus was not air tight leading to the escape of sum gases....
thanx blablabla...good luk 2 u 2;)
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 12:31:19 am: Quote from: examfreak on June 02, 2009, 12:05:47 am
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.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 02, 2009, 12:32:48 am: PPL there is nothing like NaCl .. :S
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 12:36:13 am: Quote from: shamanking on June 02, 2009, 12:08:58 am
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.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 12:37:23 am: Quote from: Jalwardi on June 02, 2009, 12:32:48 am
PPL there is nothing like NaCl .. :S

Consider all possibilities; you never know.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 02, 2009, 12:39:13 am: 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

Quote from: XYZ91 on June 02, 2009, 12:37:23 am
Quote from: Jalwardi on June 02, 2009, 12:32:48 am
PPL there is nothing like NaCl .. :S

Consider all possibilities; you never know.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 12:41:24 am: Quote from: Jalwardi on June 02, 2009, 12:39:13 am
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

Quote from: XYZ91 on June 02, 2009, 12:37:23 am
Quote from: Jalwardi on June 02, 2009, 12:32:48 am
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 ...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 02, 2009, 12:46:16 am: fine .,,,,

Quote from: XYZ91 on June 02, 2009, 12:41:24 am
Quote from: Jalwardi on June 02, 2009, 12:39:13 am
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

Quote from: XYZ91 on June 02, 2009, 12:37:23 am
Quote from: Jalwardi on June 02, 2009, 12:32:48 am
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 ...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: LupeFiasco on June 02, 2009, 01:01:33 am: 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. :( :( :'(
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: Jalwardi on June 02, 2009, 04:10:44 am: im doing the paper after 2 hours ..
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: LupeFiasco on June 02, 2009, 04:50:30 am: 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
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: hacker911 on June 02, 2009, 09:32:04 am: hey.........
NaCl effect on yeast suspension(u hav to cut a plastic pipette for this).....
transverse leaf slide.......
Best o Luck....
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 12:58:36 pm: What was everybody's value for area of field of view?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 02, 2009, 01:27:57 pm: i remember getting 159 stomata! did anyone else get that??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 01:42:39 pm: Quote from: musicfreak on June 02, 2009, 01:27:57 pm
i remember getting 159 stomata! did anyone else get that??

I think there were 28.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 02, 2009, 02:03:34 pm: whats the radius? is it 3x100micrometers . then u divided it by 2? i beliv u get 150micrometer? change it to mm.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 02:07:57 pm: Quote from: pikutata on June 02, 2009, 02:03:34 pm
whats the radius? is it 3x100micrometers . then u divided it by 2? i beliv u get 150micrometer? change it to mm.

0.15 mm
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 02, 2009, 02:11:23 pm: [/quote]

0.15 mm
[/quote]

yeah, so thats the radius? the eyepiece thing is there just to confuse us?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: XYZ91 on June 02, 2009, 02:12:06 pm: Quote from: pikutata on June 02, 2009, 02:11:23 pm

0.15 mm
[/quote]

yeah, so thats the radius? the eyepiece thing is there just to confuse us?
[/quote]

The radius is 0.15 mm. Yes, that was to create confusion.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on June 02, 2009, 02:14:41 pm: yea i counted 28 also... :D
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 02, 2009, 02:16:10 pm: Quote from: lys90 on June 02, 2009, 02:14:41 pm
yea i counted 28 also... :D

me too. some of them are blurry, and some of them are halves...

but i counted those full stomata and i get 28.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: dcgs on June 02, 2009, 03:00:36 pm: i got 29....but then the radius is deff 0.15 and it asked how many stomata in 1 mm2, so the ratio is; 29:0.07 therefore to get 1 mm2, divide 29 by 0.07, so the answer i think was 114 or something.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: dcgs on June 02, 2009, 03:06:18 pm: By the way sorry the 0.07 is the area. 3.14 X (0.15)2 is 0.07. its the area
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on June 02, 2009, 03:10:05 pm: i think somehow missed out the x40 for the area of the field of view, and the stomata was x100. so u have to take the ratio, [(3.14)(0.15x0.15)/40] x 100=158.5

should be lo...........
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 02, 2009, 03:11:48 pm: well u had to count the no of stomatas per mm2...so the no of stomata in the area of view were 28 but per mm2 was what??
i got 159 after calculation... did anyone else get that??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 02, 2009, 03:13:19 pm: 0.07? no..i ddnt get anything like that...well...did we even need the graticule thingy? i ddnt need it at all:s the stage micrometer was 0.1 mm and the diameter was 3 micrometer divisions ..thus it was just...0.3 mm??
am i right?
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 02, 2009, 03:17:05 pm: 159? no.. i got like 369 stomata...:S
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: LupeFiasco on June 02, 2009, 03:19:01 pm: Quote from: musicfreak on June 02, 2009, 01:27:57 pm
i remember getting 159 stomata! did anyone else get that??

lol got 155 but still wrong, if u noticed the difference in magnification b/w the pics........the area of viewing pic was x40 while the other was x100.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: pikutata on June 02, 2009, 03:43:38 pm: sh*t, i never count in the magnificiation. OH GAWD!! i think i get like 400++ stomata per mm.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: examfreak on June 02, 2009, 03:45:39 pm: i dnt tink that u shud count in the magnification cz watever the magnification is ,the actual area is still the same...
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: dcgs on June 02, 2009, 06:46:11 pm: exactly, thats y u dont have to divide or multiply by the magnification and stuff. it gave you the actual area and the stomata picture used the same area.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: dcgs on June 02, 2009, 06:51:31 pm: Quote from: examfreak on June 02, 2009, 03:13:19 pm
0.07? no..i ddnt get anything like that...well...did we even need the graticule thingy? i ddnt need it at all:s the stage micrometer was 0.1 mm and the diameter was 3 micrometer divisions ..thus it was just...0.3 mm??
am i right?

examfreak, you have to divide by 2 for the radius, as that is the diameter, radius is halve the diameter
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: lys90 on June 02, 2009, 08:04:55 pm: u still have to take into account the magnification thing. cause u won't be able to get as much stomata with only x40. imagine in one football field u found 22 players at fixed position, if we focus only at the penalty box of one side, u might be able to find one goalkeeper and a few defenders or maybe opponent striker.
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: musicfreak on June 02, 2009, 08:27:44 pm: ok..this is what i did... sumone tell me if its rong or correct
0.3/2=0.15mm
den 3.142* (0.15)'2 = 0.0706mm2 ..........this is the MAGNIFIED value
den the magnification was x40 so.... mag = magnified/ actual .....so actual= magnified/magnification
= 0.0762/40
=0.00177mm2 (this is ans to the first one)

den....no of stomatas when its magnified x100 was 28
so what wudit b if its per mm2??
i found the area of the field view after its magnified x100 by .... 100*0.00177=0.177

therfore 28 stomatas in 0.177mm'2 so how many stomatas in 1 mm'2??
0.177/28= 158.... the calculator when u use larget no of significant figures gives 159.0 ..(summin)

did anyone else do this?? and is it correct??
Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
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Title: Re: BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
Post by: nid404 on May 13, 2010, 04:39:23 am: DO NOT DISCLOSE ANYTHING FOR 24 HOURS BEFORE DOING THE PAPER