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AQA Biology B2 - Unofficial Mark Scheme Watch

  • View Poll Results: What do you predict your score?
    < 10%
    3.14%
    > 10%
    0.42%
    > 20%
    1.68%
    > 30%
    3.35%
    > 40%
    4.72%
    > 50%
    6.50%
    > 60%
    14.47%
    > 70%
    23.58%
    > 80%
    28.93%
    > 90%
    10.38%
    100%
    2.83%

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    (Original post by Naco88)
    ↑↑↑ In the poll above, and answer like '> 30%' would mean between '30%' and '40%' ↑↑↑


    Remember a question? Post your answers below.
    Follow me and I will try and post the answers for the Chemistry and Physics exams on Wednesday and Friday.
    AQA B2 Higher - Unofficial Mark Scheme (Updated Regularly) (Should have the last few questions of foundation)
    1. Athlete Question
    a)
    i) Anaerobic means respiration without oxygen
    ii) The athlete was running for 1.5 minutes.
    b) How do you know it was anaerobic respiration?
    The athlete produced lactic acid

    2. Pond weed Photosynthesis. - Move the light different distances from the pond weed. Count bubbles in one minute. Keep pond weed length the same.

    3. Enzymes question. - Circle Question: Cytoplasm.

    4. Plantains, Quadrats. To improve their investigation: Use random sampling, take more samples.
    I got the number of plantains per square m at 3.125

    5.Polydactyly Question
    Stem cells are undifferentiated stem cells that can potentially become any cell.

    6. Removing bacteria from milk with catalase.
    • Advantages: Catalysts can be reused
    • Disadvantages: Enzymes can denature
    These weren't the only ones but are the ones I have seen posted the most.

    7. Meiosis & Mitosis. The sperm cells were produced in the testes by Meiosis. The embryo divided by Mitosis.
    For the question about the size of each cell:
    1. 6.6
    2. 13.2
    3. 6.6
    4. 3.3
    8)
    Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
    Why were the foxes on the 3 islands varies but still the same species?
    The islands have similar conditions so the two species adapted similarly and were so similar they could still interbreed so were still of the same species.

    I am not sure what question these answers were for)
    • Muscular tissue contracts and churns food in the stomach
    • Epithelial tissue covers the stomach
    • Glandular tissue secretes hormones and enzymes
    Note: The questions may not be in the right order.

    This is a mix of my answers and those of the community but they are not guaranteed to be correct.


    Do you rember any of the marks?
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    (Original post by Redcoats)
    For advantages and disadvantages of the hydrogen peroxide method, I put it would cause less environmental damage (as the other method worked at 138 degrees) and the disadvantage was that hydrogen peroxide can not kill disease causing bacteria so may not be able to kill some bacteria present in the milk (which are threatening to humans). Is this correct?

    i put the same thing , hope its right
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    (Original post by Blahblahblah7)
    Do you rember any of the marks?
    All I remember is that the second question was a 6 marker.
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    (Original post by GCSE_core)
    People are writing about it not denaturing and lowers the cost etc but that wasn't in the text was it?😬
    I didn't write about cost because it could have been an advantage or a disadvantage.
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    (Original post by Naco88)
    All I remember is that the second question was a 6 marker.
    Same, they should really release a mark scheme a few days after the exam.
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    (Original post by GCSE_core)
    People are writing about it not denaturing and lowers the cost etc but that wasn't in the text was it?😬
    noo wth im getting scred now i think i misread the text
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    1c) was why the extra blood flow helped the athlete (4 marks) I think
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    (Original post by emilyphillips17)
    I'm hoping you're smart because I put 1 too 😂😂 it said that lactic acid built up so I thought it'd remain the same for a little while to pay back the oxygen debt?
    Yeah because surely if he ran for 1.5 it wouldn't level off it would keep going up? It stopped increasing at 1 though📚
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    [QUOTE=Fluffpuffle;65640073]1c) was why the extra blood flow helped the athlete (4 marks) I think[q/QUOTE]

    I put extra blood flow supplies more glucose and oxygen for muscles so they carry out faster aerobic respiration which releases energy for muscle contraction. Also increased blood flow removes lactic acid from muscles to minimise fatigue (hope this helps!)
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    (Original post by goldenusername)
    noo wth im getting scred now i think i misread the text
    How did you interpret it?
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    (Original post by Naco88)
    I didn't write about cost because it could have been an advantage or a disadvantage.
    Did you just use what was in the text?
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    (Original post by GCSE_core)
    Did you just use what was in the text?
    Pretty much.
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    (Original post by Naco88)
    Pretty much.
    Okay Thankyou for the reassurance! Did it saying anything about denaturing or allergies as I'm sure it didn't?
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    Will I get the mark for saying testicles instead of testes?
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    (Original post by EBeddowes)
    Will I get the mark for saying testicles instead of testes?
    I did a past paper with the same question and yes you will.
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    (Original post by Naco88)
    I did a past paper with the same question and yes you will.
    Cheers! I'm predicting myself 48/60 - do you reckon that would be an a*?
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    (Original post by GCSE_core)
    Okay Thankyou for the reassurance! Did it saying anything about denaturing or allergies as I'm sure it didn't?
    It didn't say anything about them denaturing but it could be an answer.
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    I just posted the predicted grade boundaries.

    Look in the title thread for them
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    Will u have the mark scheme for double science?
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    does anyone know the answers to that hair question... i literally guessed that lol i have never seen genotypes ever in my revision book bUT ITS 5 MARKS I can't believe myself
 
 
 
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