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    Think I got about 39/40 marks so I'm happy - but I did mess up on the percentage question put 66.6
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    I know it's like far too early to be asking this, but just to try and calm myself a bit , any predictions for grade boundaries seeing as the test was considerably harder than all other past papers? I was thinking something like low/mid 40's for an A*, but maybe that's too optimistic, any other predictions?
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    (Original post by KingKateley)
    For the question about the thrush and snail, could you put about how the snails lack of movement means less energy is used up in movement, meaning the thrush would gain greater biomass?
    What was the question for this?? I don't remember it
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    (Original post by hguin)
    Lets create the unofficial mark scheme for today's biology paper, please help by commenting in this format: [Question number - Question - Answer - marks given].

    Please continue to submit answers!


    Unofficial markscheme

    1. Llegal, recreation (1)

    2. Changes chemical reactions, causes withdrawal symptoms (1)

    3. Independent company - not associated with the drug company (1)

    4. Unbiased (1)

    5. Effects nicotine, which is the same area as alcohol in the brain. Reduces pleasure, more likely to drink less (2)

    6. Boys drink beer, cider but the girls drank more wine, alcopop and spirits. (2)

    7. Not all boys drink because...(2)

    8. Carbohydrates --> Energy, Protein --> Growth + repair, Fat --> Warmth + energy, Fibre --> helps digestive system, Calcium --> strong bones and teeth, Water --> Hydrated the body (6)

    9. Temperature sensor - more accurate/easier to read because digital (1)

    10. It increased because micro organisms break down grass, respire and release CO2 This is trapped because of cotton wool so it accumulates and increases (2)

    11. It levels off at 20% because either not oxygen left for microorganisms to respire or all of the grass has been decomposed so the microorganisms have nothing left to feed on to respire (not sure) (1)

    12. Receptor (e.g eyes/tongue/nose/skin/ears) detect stimuli and pass on an impulse. Effectors (e.g muscles/glands) receive an impulse and respond by contracting/releasing hormones (4)

    13. Synapse - junction/small gap between two nerve endings/neurone (2)

    14. Neurotransmitters diffuse through the synapse, attach onto nerve ending and continues pulse (2)

    15. Sense organ using spinal chord - skin (1)

    16. Mean speed = 80/50 = 1.6 (2)

    17. Why is brain (without relay neurones) faster than spine? Less time wasted for impulses to be passed through the relay so it travels faster than the spine because of a shorter distance (2)

    18. Biomass is lost through waste/energy/heat/respiration/movement (2)

    19. There is a large amount of snails (200) as opposed to thrush (2) meaning they have less competition and ate more snails this more biomass (2)

    20. It is a scatter graph because it is comparing two sets of data (1)

    21. Higher percentage of no striped snails in woodlands but low percentage in grassland. Whereas with the light coloured snails, there's a higher percentage in grassland and low percentage in woodlands. (2)

    22. Woodland snails are better adapted because they are camouflaged (1)

    23. Horses foot size increased, amount of foot touching the floor decreased (2)

    24. Foot has a larger surface area so less pressure on soft mud so they don't sink into the ground (2)

    25. Variation in genes/mutations, better characteristics allow it to survive better and breed so their genetic material are passed onto the next generations. (4)

    26. Advantages 1. Males are released, they don't feed of blood so they don't cause malaria. 2. They reproduce so the children die before they become female adults and reduce malaria outbreak

    27. Disadvantages 1. Millions are released which could disrupt food chain, may even reduce biodiversity. 2. There could be long term side effects

    28. Overall they should/shouldn't release the mosquitos because... (4)

    29. Cut the gene using an enzyme from the DNA of the bacteria. Cut the DNA, using an enzyme, of the mosquito and insert the gene into it. Put the cell back into... (3)

    30. First part of the food chain are producers i.e plants (2)

    31. Mayfly larvae (animal) - water pollution (1) 32. Oxygen meter/rat tailed maggots/sludge worms for water pollution (1) 60 marks


    http://www.thestudentroom.co.uk/show...&postcount=317
    my last answer was to use satellite.
    please someone tell me that's also right
    "-3-
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    (Original post by Sint)
    What did people put for why the 50million years old horse had feet that were well-adapted for its environment? I put large surface area so it wouldn't sink but crossed it out because the question specifically said why is it good that it has lots of joints, or would this still be correct?
    Still correct. If it is about joins then most of use would fail that question. More about Natural selection and pressure and no sinking etc...
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    guys did you see on question 3 a ii) there was a MASSIVE MISTAKE
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    just seen the headlines what have i missed #banter
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    (Original post by geographymaster)
    guys did you see on question 3 a ii) there was a MASSIVE MISTAKE
    you will never believe it, NEWS FLASH
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    (Original post by Cirsium)
    Yeah I know. It just amuses me. Imagine flunking half the paper and still getting an A*!
    And the papers for the 3 science for unit 1 in 2012 were so easy too!!!
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    (Original post by McFlufflepants)
    Wrong 0.7% because 0.666 rounds to 0.7 not 0.6
    when doing any calculations if your doing something that is recurring you round it to 2d.p., NOT one. so the answer was 0.67% or 0.6% with a small dot above the six. otherwise you will not get the mark.
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    (Original post by geographymaster)
    you will never believe it, NEWS FLASH
    What was the newsflash?
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    For the last questions could you of said lichens or was it asking for animals?
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    Does anybody know the answer to the fish and mosquito? Can't really remember the question
    • Welcome Squad
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    Welcome Squad
    Why was the thermostat connected to the data logger better than the thermostat on its own? (something like that)
    For the answer i put that it was better as it could automatically record the data.
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    (Original post by charliej2802)
    The Calc was: (2,000,000/300,000,000) x 100?
    Gave me 0.666666666% so 0.67%
    Got that too'
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    (Original post by Nathan Emmings)
    What are you thinking then regarding boundaries?
    44 is the average if you combine all the grade boundaries but since this one was hard i would say 42 for A*? If they lower them it wouldn't be lower than 39 if they choose to keep them average i feel like it will be 45 maximum (for A*).
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    Can anyone tell me what they put for the question about decaying grass and carbon dioxide? I literally said the decaying grass releases carbon that gets trapped inside of the vacuum flask.
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    (Original post by ETAE)
    I know it's like far too early to be asking this, but just to try and calm myself a bit , any predictions for grade boundaries seeing as the test was considerably harder than all other past papers? I was thinking something like low/mid 40's for an A*, but maybe that's too optimistic, any other predictions?
    it would probably be more like 45 - 52; sorry to drown your feelings
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    (Original post by IshaAmaani)
    Does anybody know the answer to the fish and mosquito? Can't really remember the question
    I'm pretty sure the answer was about the primary consumer being a plant in all food chains, so it couldn't be a mosquito
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    (Original post by Tompicko22)
    Can anyone tell me what they put for the question about decaying grass and carbon dioxide? I literally said the decaying grass releases carbon that gets trapped inside of the vacuum flask.
    I started talking about respiration.
 
 
 
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