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    For 2 i) wasn't it 13.9/14 for the reading on the graph
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    probably not as long as you included some good terminology
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    any mark scheme for paper 1BR????
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    (Original post by JackCollard)
    Hope everything went well for you all: Trying to pull together as many known correct answers as possible and I'm certain I will miss questions so do add in your answers if you are rather sure you got them right! Do comment if some of these are wrong.

    (Question) [Given Words]

    1. Vacuole, Cell Wall, Chloroplasts
    b) Receptor (sensory) Relay Neurone, Motor Neurone, Effector / Response
    bi) (Gap between relay and motor neurone?) Synapse
    c) 3/400th of a second or 0.0075 seconds

    2. Fish spike in 1990s reach 66 million tonnes - Beef has a smaller range from 1950s to 2012 and fluctuates a lot more with some decreases in a million each year. Generally both a positive gradient of increased production

    i) (Calculation In 2020 fish production will be Six times 1990 rate - how many fish?)
    13 million tonnes in 1990 so X 6 = 78 Million Tonnes in 2020

    b) Fish proteins broken down by pepsin or protease in stomach to form simple Proteins, Also digested by Low pH Hydrochloric acid found in stomach and some pummelling and ,technical digestion from stomach

    c) (Table of what protein structures do what)
    Insulin made in pancreasAmylaseAntibodies made in Lymphocyte3. Cars, engines, factoriel anything that run on fossil fuels
    b) Sulphur Dioxide, CFCs or Water Vapour
    c) Percentage decrease of 16 percent

    4. Methane decreases with a range of 2.5 starting at 4.6 million tones in 1990 decreasing to 2.1 million tones in 2010

    5.Ice caps melt, Extinction of polar bears or wildlife
    Thinner Greenhouse gas layer so less global warming
    better air quality with a higher oxygen to greenhouse gas ratio
    less carcinogens or disease bearing particulates in the air

    6. CORMS method (Describe an Experiment)

    7. Graph

    b) Describe your graph

    8. Thistle

    b) The bird name

    c) A= Pupil
    B= Iris

    d) Conjuctiva, Sclera or Cornea (up for debate as all protect eye in one way or another)

    Optic Nerve

    Lens

    9. [Fill in the gap question]
    Explant, [genetically] identical, Sterilise, Bacteria, Growth or Culture [medium], starch, Chlorophyll, Nitrates, can't remember the rest

    10. A population is the number of same species within an ecosystem / area

    b) Describe the changes in populations of the snail colours with reference to natural selection: referencing these words will get you the marks:
    Mutation
    Variation
    Gene
    DNA
    Phenotype
    Black shell preyed upon
    grey shell is a genetic mutation and survives 'more' or 'better' than black shell
    Grey shell passes its genes on
    White shell mutation is the most effective and these genes pass on
    Black genes extinct, grey rare
    All happens over a Number of generations

    [Question Added]

    (How do stomata allow For transport)
    Guard Cells Open
    Water diffuses out of stomata through transpiration (High conc to low conc outside)
    This then create a lower conc of water in the spongy mesophyll (leaf)
    High conc of water in xylem of plant / stem
    Water moves from this area of high conc to area of new low conc in leaf

    [Question Added]

    (How do Stomata Allow Gas exchange) -
    diffusion through open stomata of co2 for photosynthesis -
    excretion of o2 as biproduct of photosynthesis -
    diffusion- define

    [Question Added]

    (Why does Wind create more transpiration / water loss from leaf?)

    There is a high conc. of Water inside the leaf
    Low conc. in the air outside
    diffusion of water occurs to outside
    The wind then moves this saturated air away from the plant
    New dry air arrives at the leaf
    Another conc. gradient is set up as the dry air has no water in so low conc
    but high conc. in leaf and transpiration occurs again
    process / cycle repeats



    11. (children doing exercise)
    a) 136.1 BPM (average heart rate whilst exercising)

    b) Thomas was the anomaly

    c) Heart rate slightly increases just before exercise due to adrenaline being secreted from the adrenal gland causing heart rate to increase. (could mention excitement causes the adrenaline)

    d) (Two things to keep the same) [mention two]

    Length of ExerciseAge of Children / bmi of children

    Time measuring heart rate

    Same temperature / time of day

    12. (Runners and Cyclists lower resting BPM Question)
    The heart muscle is stronger as it is exerted more often, hence more blood can be pumped in the same number of beats, reducing the need for their heart to pump blood at a high frequency.

    13. Protoctist - all x except for cytoplasmBacteria - tick for cell wall, plasmid,cytoplasm x for nucleusfungus - tick for cell wall, nucleus, cytoplasm x for plasmid

    b) [protoctists, Fungi, Bacteria - name one more pathogen] Virus

    c) (Protoctist disease?) Malaria

    14.
    i) Oviduct or Fallopian Tube

    ii) Ovaries

    iii) Uterus Lining

    iv) Vagina

    15. (Label diagram with O for Ovulation and M for menstruation)

    O was the first peak and M was the second peak on the graph

    b) Oestrogen causes the thickening or building up of the uterus lining
    Progesterone then causes blood to build up through the build up of capillaries in the uterus lining
    If Fertilised egg is not implanted the Uterus Lining passes out of the vagina

    16. (Question on Why is Sex off period not always a reliable method of contraception)
    Women menstrual cycles, whilst predictable can sometimes be different to what they are normally and the sperm (because there are so many of them) will always make it to the fillopian tube where fertilisation takes place because there is no condom or barrier method to stop them. women won't know if they are ovulation, only know of period, so the sperm could fertilise an egg.

    b) (What does Oestrogen do in puberty?) [Any Three From]

    Widening Of Hips

    Slight gradual Lowering Of Voice

    Pubic Hair

    Ovulation Begins

    c) (Which Parent determine babies Sex?)

    Father, as a sperm carry either an X or a Y set of chromosomes and because a women;s chromosomes are always XX, the egg is always carrying a set of an 'X'chromosomes so the sperm can create an XX (female) or XY (Male) baby.

    d) (Differences Between Meiosis and Mitosis) [Mention Four of the following: One mark = One comparison]

    Mitosis creates two daughter cells
    Meiosis creates four daughter cells
    Mitosis creates genetically identical cells
    Meiosis creates Genetically different cells due to the 'crossing over' process
    Mitosis creates two new cells with 46 / a full set of chromosomes
    Meiosis creates four new cells with 23 / half a set of chromosomes
    Mitosis creates Diploid Cells
    Meiosis creates Haploid Cells

    Good Luck for the rest of you GCSEs, Will be back for Paper Two!
    I have added to question 9 (which was the passage) the "culture" for growth medium as culture medium also means the same thing
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    (Original post by samiyah jameel)
    I put glucose as well, I think you will get the mark for both
    it's not glucose or starch... it's nutrients because plants cannot absorb starch and glucose DIRECTLY from the soil etc
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    What % do you think will be an A*, based on that paper? The past has been like 70-75% right?
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    (Original post by oli19919)
    What % do you think will be an A*, based on that paper? The past has been like 70-75% right?
    An A* is 76% in Bio
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    the spec never included synapses yet there it was in the exam.
    good job edexcel
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    Question 8D was either sclera or cornea, but not conjunctiva. The description was tough outer layer which protects the eye. Conjunctiva is not desciribed as a tough outer layer, edexcel itself describes both the cornea and sclera as this, but not the conjunctiva.
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    Wasn't the reading on the graph for 2 I) 13.9/14 million tonnes everyone at my school says it was?
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    Has anyone made a mark scheme for paper 2 yet??
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    (Original post by amkay)
    Has anyone made a mark scheme for paper 2 yet??
    I haven't seen one, but let me know if you do!


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    http://www.thestudentroom.co.uk/show...cse+biology+2b

    (Original post by grace_wh)
    I haven't seen one, but let me know if you do!


    Posted from TSR Mobile
    (Original post by amkay)
    Has anyone made a mark scheme for paper 2 yet??
    For paper 2B
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    Ok so i think i got
    P1:
    99/120 = 82.5%

    P2:
    47/60 = 78.3%

    TOTAL MARK:
    82.5 + 78.3 / 2 = 80.4%

    Is this an A*???
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    (Original post by Talkand...Talk)
    Ok so i think i got
    P1:
    99/120 = 82.5%

    P2:
    47/60 = 78.3%

    TOTAL MARK:
    82.5 + 78.3 / 2 = 80.4%

    Is this an A*???
    Yeah, usually the grade boundary for A* is 135-140/180. Looks like youve got 146/150, which should comfortably be an A*
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    (Original post by jamesj477)
    Yeah, usually the grade boundary for A* is 135-140/180. Looks like youve got 146/150, which should comfortably be an A*
    THANK YOU, , so relieved
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    (Original post by Talkand...Talk)
    THANK YOU, , so relieved
    will probably be even lower than 135 this year, paper one was hell.
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    (Original post by Abodee1)
    will probably be even lower than 135 this year, paper one was hell.
    131/180 for an A* this year. I am so disappointed because I got 129/180 and I should've done a lot better than that. What did everyone else get?
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    (Original post by laroosey)
    131/180 for an A* this year. I am so disappointed because I got 129/180 and I should've done a lot better than that. What did everyone else get?
    how have you found out your actual mark? The only ones we got were for latin and greek. But you should definitely get that remarked, that A* isn't out of reach!
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    (Original post by laroosey)
    131/180 for an A* this year. I am so disappointed because I got 129/180 and I should've done a lot better than that. What did everyone else get?
    Oh, that's a shame, but you're very close to the A*. It might be worth a remark.
    I got 166/180, which I am very pleased with . However, a lot of my friends also missed out on their predicted grades by a few marks, and they are going to get remarks. And as you are only 2 marks off the A*, you are extremely unlikely to be marked down a grade on a remark, and have some chance of gaining those 2 extra marks, so yeah, go for that remark!
 
 
 
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