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AQA BIOL2 Biology Unit 2 Exam - 26th May 2011 watch

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    For the grease on plant B (or whatever) i said that the grease reduced light intensity to the plant which then meant the stomata did not open as gaseous exchange was not needed for photosynthesis.

    Quite upset i didn't have to write Plasmodesmata in my paper
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    i think it was explain the graph for a for 3 mark? if it was then i put:
    high rate of loss of mass because of higher rate of loss of water at beggining as water diffused out through stomatal pores(and transpiration or something)
    (from 0-60)

    from 60-onwards

    water potential of cells is lower becaus there is less water (all was lost~) so less water evapourated to air spaces=less vapour diffuses out of stomata=less waterloss=less loss in mass
    (lower rate)
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    (Original post by ??????????????????)
    Oh I just said the grease was water proof.
    LOL @ how all of us have put different answers..
    who knows what the right answer is...
    LOL
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    (Original post by ??????????????????)
    Oh I just said the grease was water proof.
    What about the stomata remaining closed in order to prevent movement of water by osmosis which would decrease its mass?
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    What are people thinking that the grade boundary is for a C?
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    It still loses mass because she only covered the upper surface with grease. She left the lower surface (which generally contains more of the stoma) uncovered and thus transpiration could still occur down there so it still lost mass, just not as much.
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    How was it guys? Hard? Easy? Just wanted to know coz i have chemistry tomorrow!
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    (Original post by Wick3d)
    What about the stomata remaining closed in order to prevent movement of water by osmosis which would decrease its mass?
    Could be anything. I just thought of it as an artificial waxy cuticle.
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    (Original post by ??????????????????)
    Could be anything. I just thought of it as an artificial waxy cuticle.
    Don't worry it was only a few marks out of 85.

    And who knows with AQA and their dodgy mark schemes.
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    (Original post by Wick3d)
    What about the stomata remaining closed in order to prevent movement of water by osmosis which would decrease its mass?
    I think the main concept is about a preventation in a water potential gradient. The other user talked about waterproof = no water potential gradient. Stomata closed = no water potential gradient, therefore less loss.
    I think i just mentioned w.p gradient reduced, so less loss of water
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    I came out feeling quite happy about it tbh, fingers crossed I did OK
    I should really be revising chemistry now but wanted to have a quick look on here, it's turning into a 15 minute long look now xD
    Hope you all found it OK
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    will I get the mark for stating % difference as 52.2 because I used 9.2 NOT 9
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    (Original post by EffKayy)
    I think the main concept is about a preventation in a water potential gradient. The other user talked about waterproof = no water potential gradient. Stomata closed = no water potential gradient, therefore less loss.
    I think i just mentioned w.p gradient reduced, so less loss of water
    I said waterproof so doesn't evaporate from the surface of the leaf as much... D:
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    (Original post by jsmith6131)
    will I get the mark for stating % difference as 52.2 because I used 9.2 NOT 9
    One for the working out and you might get another if there AQA gives a range.
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    ok thanks
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    (Original post by Kisskoli)
    some animal cells have cell walls.... its cellulose cell walls that are only in plants?
    Animal cells never, ever, everrrrrrr have cell walls. ever.
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    (Original post by specialapple)
    animal cells never, ever, everrrrrrr have cell walls. Ever.
    eveeerrrrrr
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    As for the structure in plants but not Animals it was
    Chloroplasts and starch store?
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    (Original post by davis053)
    As for the structure in plants but not Animals it was
    Chloroplasts and starch store?
    Tbh seemed to be most of the stuff on the diagram, both them are right.

    I went for Cell Wall + Chloroplasts.
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    (Original post by M | k e)
    Tbh seemed to be most of the stuff on the diagram, both them are right.

    I went for Cell Wall + Chloroplasts.
    Me tooo
    The first set of pages was awesome
    then came onto the hsw questions
    :eek:
 
 
 
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