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BIOL4 Biology Unit 4 Exam - 13th June 2011 Watch

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    (Original post by Abby :))
    Heyyy can someome help me... ive seen this Q a couple of times and i really cant find the answer!

    What are the advantages of using a pyramid of biomass/measuring in biomass???
    Pyramid of numbers often misrepresent the energy in a food chain due to primary consumers often being insect which are more numerous than the producer e.g. tree therefore the pyramid isn't shaped as a pyramid whereas in biomass the tree which has more biomass than the insects will have a wider trophic level therefore shaped like a pyramid and representing the transition of energy more accurate however this falls in cases such as crickets which have seasonal spurs in which they are actually of greater biomass than the producer in which case we use the pyramid of energy which records the average energy absorbed by the organism yearly, therefore seasonal spurs which are anomalies are evened out and the shape is always a pyramid as energy cannot be gained only lost across a food chain.

    The reasons are fairly obvious e.g. indigestible matter, respiration(includes biosynthesis e.g. growth/reproduction), heat loss in endothermic organisms(warm blooded)
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    Pyramids of biomass can be represented on a suitable scale. It takes into account the size of the organisms aswell unlike pyramids of number.
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    (Original post by Abby :))
    Heyyy can someome help me... ive seen this Q a couple of times and i really cant find the answer!

    What are the advantages of using a pyramid of biomass/measuring in biomass???
    measuring biomass is more reliabe than just counting organisms at each level
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    I'm off guys! Good luck and make sure you smash the paper!
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    Best of luck to all doing this exam! I hope there's no awkward HSW questions
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    Rightt everyone im getting off this now, to get myself ready to leave and do some last minute cramming! Good luck xxx
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    (Original post by Master.K)
    I'm off guys! Good luck and make sure you smash the paper!
    But then I won't be able to write on it!

    Btw at what time is everyone having their exams?
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    (Original post by Stratos)
    But then I won't be able to write on it!

    Btw at what time is everyone having their exams?
    same time as urs lol?
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    (Original post by Stratos)
    But then I won't be able to write on it!

    Btw at what time is everyone having their exams?
    13:00, isn't it that for everyone? Unless there's a clash?
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    What are the effects of global warming??
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    (Original post by Tericon)
    13:00, isn't it that for everyone? Unless there's a clash?
    Nope, it varies. Just most places do it around 1-2pm.
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    (Original post by Tericon)
    13:00, isn't it that for everyone? Unless there's a clash?
    nope at my school afternoon exams start at 14:00 as lunch time starts at 13:00/15
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    Mine start at 14.30 o.O
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    (Original post by Rickesh)
    What are the effects of global warming??
    increased CO2 production. Increased methane production. increase in global temperatures. affects species distribution and diversity in areas. causes ice caps to melt, increasing sea levels. all that shiz.....
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    (Original post by Eloades11)
    Best of luck to all doing this exam! I hope there's no awkward HSW questions
    Thanks, but that's like saying 'I hope there's no Biology!'

    Awkward HSW questions are inevitable in an AQA Biology exam..especially in Unit 4!


    Also...nice uni firm choice.....
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    (Original post by SK-mar)
    increased CO2 production. Increased methane production. increase in global temperatures. affects species distribution and diversity in areas. causes ice caps to melt, increasing sea levels. all that shiz.....
    Also, according to CGP, increases crop yield as more CO2 - limiting factor in photosynthesis and may disrupt insect life cycles, they may emerge from larval stage quicker.
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    (Original post by Tericon)
    Also, according to CGP, increases crop yield as more CO2 - limiting factor in photosynthesis and may disrupt insect life cycles, they may emerge from larval stage quicker.
    yep the larval thing comes from increased temperatures. for every 1 degree they may come out 10 days earlier than expected. forgot about the crop yields thingy so cheers!


    how you gonna approach the paper btw? I think im gonna do the last two questions first. get the 5 markers out the way whilst im fresh and tackle the supposedly hardest question... what you think?

    good luck bro!
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    (Original post by Tericon)
    Thanks, but that's like saying 'I hope there's no Biology!'

    Awkward HSW questions are inevitable in an AQA Biology exam..especially in Unit 4!


    Also...nice uni firm choice.....
    I'm afraid you're right, what I should have said was "I hope there's no awkward ones "

    Thanks, you also going to Warwick?
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    (Original post by Eloades11)
    I'm afraid you're right, what I should have said was "I hope there's no awkward ones "

    Thanks, you also going to Warwick?
    Yep, Law though.... I don't think I could take anymore of Biology Lovely campus, have you picked accomodation? I've put Cryfield and Whitefield down as top two, only because they're the cheapest and I'm a cheapskate

    So I'm not completely off-topic: Good luck if you're sitting this
 
 
 
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