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edexcel biology unit 2 and 3b

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    hahah ow god i am sooo scared! ahhhh! lol.
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    (Original post by MarshmallowBob)
    hahah ow god i am sooo scared! ahhhh! lol.
    i am really scared, i only solved may 2009 !!!
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    (Original post by demdil)
    i am really scared, i only solved may 2009 !!!
    I've solved all the pastpapers, and IM STILL SCARED!! lol.i finished them 3 weeks ago. and i cant recall anything .
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    (Original post by MarshmallowBob)
    I've solved all the pastpapers, and IM STILL SCARED!! lol.i finished them 3 weeks ago. and i cant recall anything .
    once they give you questions tomorrow, you will start to remember everything i always feel like i dont remember anything before the exam, but during the exam it all comes back to me
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    Here are some external resources I found for mitosis + totipotency. Enjoy:
    http://www.nuffieldfoundation.org/pr...oot-tip-squash

    https://docs.google.com/viewer?a=v&q...4BTnCr2wTuJ0Kw
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    (Original post by verdikt)
    Here are some external resources I found for mitosis + totipotency. Enjoy:
    http://www.nuffieldfoundation.org/pr...oot-tip-squash

    https://docs.google.com/viewer?a=v&q...4BTnCr2wTuJ0Kw
    hey thanks buddy!
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    (Original post by verdikt)
    Here are some external resources I found for mitosis + totipotency. Enjoy:
    http://www.nuffieldfoundation.org/pr...oot-tip-squash

    https://docs.google.com/viewer?a=v&q...4BTnCr2wTuJ0Kw
    thank youu .. btw, i hope they ask about totiopotency and observing mitosis tomorrow!!!!
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    (Original post by demdil)
    thank youu .. btw, i hope they ask about totiopotency and observing mitosis tomorrow!!!!
    yeah pal seriously........... i also wish. do u think they will repeat any of the experiments that have previously come?
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    (Original post by shahlakh)
    yeah pal seriously........... i also wish. do u think they will repeat any of the experiments that have previously come?
    they might ask from the experiments that came before, but they will have to change a lot and i dont know how they can change the beetroot experiment for instance. and if they dont change, and ask (eg beetroot) then the exam would be like the one in 2009 :O so either way is good they will either ask from what we solved through the past papers or they will ask totiopotency and observing mitosis. İ believe they will ask something they didnt ask before. or could be daphnia because it was in sample assesment, so doesnt really count as "came in the exam before".. dont know .. hope we all do well
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    (Original post by demdil)
    they might ask from the experiments that came before, but they will have to change a lot and i dont know how they can change the beetroot experiment for instance. and if they dont change, and ask (eg beetroot) then the exam would be like the one in 2009 :O so either way is good they will either ask from what we solved through the past papers or they will ask totiopotency and observing mitosis. İ believe they will ask something they didnt ask before. or could be daphnia because it was in sample assesment, so doesnt really count as "came in the exam before".. dont know .. hope we all do well
    yeah and as one guy stated here that what will the students of june 2013 do if all the experiments would have come up???
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    (Original post by shahlakh)
    yeah and as one guy stated here that what will the students of june 2013 do if all the experiments would have come up???
    they will change the sylabus :P joking.. i dont know. i only hope that they ask totiopotency and observing mitosis..
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    (Original post by demdil)
    they will change the sylabus :P joking.. i dont know. i only hope that they ask totiopotency and observing mitosis..
    One of my teachers said they just might and she was dead on sure that either of the two will come. But trust no one! I don't want some flame war going on if it does really come now :P
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    Hey guys: Why is Hydrochloric acid added to the root tip when observing mitosis?
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    (Original post by mrperfect)
    Hey guys: Why is Hydrochloric acid added to the root tip when observing mitosis?
    as far as i know, it is to break the middle lamella and separate cells from each other so that they are in single layer and not on the top of each other..
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    (Original post by mrperfect)
    Hey guys: Why is Hydrochloric acid added to the root tip when observing mitosis?
    To soften the tissues
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    Thanks to those who answered. How can I make the root tip experiment safer and more accurate?
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    (Original post by mrperfect)
    Thanks to those who answered. How can I make the root tip experiment safer and more accurate?
    safer by wearing eye goggle when handling the acid and stain
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    (Original post by mrperfect)
    Thanks to those who answered. How can I make the root tip experiment safer and more accurate?
    Goggles, gloves are the main keypoints. Also take care when cutting.

    I heard something about not adding excess stain to it. Is this a safety measure and if so, can anyone explain why?
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    (Original post by mrperfect)
    Thanks to those who answered. How can I make the root tip experiment safer and more accurate?
    Use gloves when dealing with HCL or orcein
    If your using orcein as your stain, make sure to avoid skin contact cuz its corrosive and highly flammable. Wear eye protection(safety goggles)
    and to improve accuracy, first thing that comes to mind is repeat the experiment a few times using the same vol of HCL,stain etc, same length of root, eg:5mm
    u cud even repeat it using a different root tip like broad bean.

    all the best man, even im pretty nervous, im just memorising all the experiments from the CGP book and doing the past papers from june 09 to jan 12, hope it all works out. Also I asked my teacher what might come in ques 2, u know that article thing, he told me to learn the lifestyle and risk factors(heart disease and stuff) and clinical trial, Obviously im not depending on that, but he's been right before so who knows :P
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    (Original post by verdikt)
    Goggles, gloves are the main keypoints. Also take care when cutting.

    I heard something about not adding excess stain to it. Is this a safety measure and if so, can anyone explain why?
    adding excess stain comes under precaution. Normally you add stain to darken the chromosomes in the root so mitosis can be observed more clearly, so adding too much stain might make the chromosomes even darker which wud make it difficult to observe mitosis...

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Updated: May 19, 2012
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