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AQA Biology B2 - Unofficial Mark Scheme Watch

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    < 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 MersennePrime)
    Did no one write that the athlete ran for 1 minute because wouldn't the blood rate remain high while he pays off oxygen debt?
    Thats exactly what i thought!
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    • Epithelial tissue I wrote was for protection mark or no mark?
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    The father question. A lot of people got mixed up with genotypes, phenotypes and gametes. It was an easy 5 marker if you understood it properly
    Phenotype - The characteristic (e.g. brown hair, red hair)
    Genotype - The alleles (e.g. Bb bb BB)
    Gametes - The offsprings genotype

    Great exam btw
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    (Original post by Charlieskye)
    Thats exactly what i thought!
    I did too!
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    (Original post by Naco88)
    ↑↑↑ In the poll above, an 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.

    ................................ ................................ ................................ ................................ ................................ ........
    This mark scheme is not official and was made purely from what we saw in the exam.

    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 Question
    • Put the pond weed in the beaker,
    • Fill the beaker with water.
    • Move the light close to the pond weed,
    • Count bubbles in one minute, / Measure oxygen produced
    • Note down your results,
    • Repeat experiment but move the light closer/further away from the pond weed each time.
    • To make it a fair test, use same amount of water, use same length/volume of pond weed, time it for the same length.
    Question 2 notes: The answer could be any experiment to test how the amount of light intensity affects photosynthesis. The question stated that you did not have to write about the equipment pictured and it was just an example.
    (6 marks)
    3. Enzymes question
    Circle Cytoplasm. (1 mark)
    What is an enzyme? (2 marks)
    An enzyme is a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
    Rest of question is incomplete
    4. Plantains in the field
    To improve their investigation: Use random sampling, take more samples.
    With the mean average question, people seemed to be getting either 10,100 or 160,000. Different answers I know but we are not sure which is right.

    Rest of question is incomplete
    5. Polydactyly Question
    Stem cells are undifferentiated stem cells that can potentially become any cell.
    Rest of question is incomplete
    This question had a lot of parts to do with alleles but it was so long no one can really remember it.
    6. Removing bacteria from milk with catalase.
    • Advantages: Catalysts can be reused
    • Disadvantages: Enzymes can denature, Hydrogen Peroxide doesn't kill all the bacteria
    These weren't the only ones but they're the ones I have seen posted the most.

    Rest of question is incomplete
    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
    Rest of question is incomplete
    8. Foxes
    How can scientists prove the foxes originated from the same species?
    The scientists could breed 2 of the foxes and see if they produce fertile offspring. (Offspring which can reproduce)
    How are the foxes different species?
    Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
    Why were the foxes on the 3 islands varied 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
    ................................ ................................ ................................ ................................ ................................ ........
    On the question about a mother and father who had 2 children we were asked about these:

    Parents genotype
    Parents phenotype
    Gametes

    Offspring genotypes
    Offspring phenotypes

    Anyone who knows the answers to these, please message me on twitter NacoRBLX, thanks!

    ................................ ................................ ................................ ................................ ................................ ........

    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.

    ................................ ................................ ................................ ................................ ................................ ........
    Grade Boundary Predictions

    These are completely my predictions, we have decided that it was a fairly
    easy paper so our boundaries are fairly high.

    A* - 46 marks

    A - 37 marks

    B - 31 marks

    C - 24 marks




    Thanks for using my mark scheme : )
    for disadvantage for peoxide one i put its a chemical so it can mix with the milk which could harm humans if we drink it would that get me the marks
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    (Original post by Abid_0805)
    for disadvantage for peoxide one i put its a chemical so it can mix with the milk which could harm humans if we drink it would that get me the marks
    Me too, hope it was right
    • Thread Starter
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    (Original post by afghan-superman)
    The father question. A lot of people got mixed up with genotypes, phenotypes and gametes. It was an easy 5 marker if you understood it properly
    Phenotype - The characteristic (e.g. brown hair, red hair)
    Genotype - The alleles (e.g. Bb bb BB)
    Gametes - The offsprings genotype

    Great exam btw
    Thanks, someone else has sent me this and I updated the mark scheme It seems that people found this was the hardest question on the paper.
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    (Original post by afghan-superman)
    Me too, hope it was right
    The spec states that humans can develop allergies to certain enzymes, so you could get the mark
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    (Original post by benisannoyedrn)
    1 Anaerobic is without the presence of oxygen, he ran for 1.5 minutes, and the level of lactic acid was higher at the end, 18dm3. Epithelial tissue cover the inside and outside of the stomach, glandular realises digestive juices, muscular churns up food.
    2. Put the pondweed in a test tube, fill up a beaker with water, put the test tube in the beaker, use a ruler to measure bubbles, use a timer to measure how long the light is on for, move away the light at the same intervals. Control variables- Time and distance of the light. I know that you aren't supposed to add equipment like I did, but it said that these are SOME of the things you may use, and I had a thick moment and started adding things😑
    3. Enzymes are biological catalysts made of proteins. They speed up reaction without being used up in the process. Advantage- Can be done at low temperatures and can be reused. Disadvantage- Enzymes can denature easily, due to things like pH.
    4. Do the maths stuff (can't remember any) and the improvements are 1. Do more samples 2. Place the quadrants randomly to eliminate bias and 3. Can't remember😐
    5. Talk about two dominant alleles or one dominant and one recessive for the mother, and two recessive a for the father. The ginger one was 25% chance of a ginger and a 50% chance for the polydactyl one.
    6. Advantages and disadvantages ( accidentally wrote those in question 3)
    7. I had no idea what pictograms were, but the bottom answer was MITOSIS.
    8. Geographical isolation, survival of the fittest, natural selection and the passing on of favourable alleles. And then the last question was that the conditions are similar on the islands and there hasn't been enough time for evolution.

    The circle question was CYTOPLASM

    That's what I got anyway. I've probably gotten some wrong, put some in the wrong order or missed some out.😳
    I thought the it was meosis because it produced gametes
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    (Original post by afghan-superman)
    Me too, hope it was right
    (Original post by Abid_0805)
    for disadvantage for peoxide one i put its a chemical so it can mix with the milk which could harm humans if we drink it would that get me the marks
    Drinking Hydrogen Peroxide can cause chemical burns in the esophagus, which can lead to scarring and even narrow it, making it more likely you'll choke.
    Yes there's a 95% chance you shall get the mark.
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    (Original post by Naco88)
    Thanks, someone else has sent me this and I updated the mark scheme It seems that people found this was the hardest question on the paper.
    yep, by the way the last questions were from the B3 paper, i done the b3 paper and got them questions too.
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    (Original post by Naco88)
    ↑↑↑ In the poll above, an 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.

    ................................ ................................ ................................ ................................ ................................ ........
    This mark scheme is not official and was made purely from what we saw in the exam.

    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 Question
    • Put the pond weed in the beaker,
    • Fill the beaker with water.
    • Move the light close to the pond weed,
    • Count bubbles in one minute, / Measure oxygen produced
    • Note down your results,
    • Repeat experiment but move the light closer/further away from the pond weed each time.
    • To make it a fair test, use same amount of water, use same length/volume of pond weed, time it for the same length.
    Question 2 notes: The answer could be any experiment to test how the amount of light intensity affects photosynthesis. The question stated that you did not have to write about the equipment pictured and it was just an example.
    (6 marks)
    3. Enzymes question
    Circle Cytoplasm. (1 mark)
    What is an enzyme? (2 marks)
    An enzyme is a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
    • Muscular tissue contracts and churns food in the stomach
    • Epithelial tissue covers the stomach
    • Glandular tissue secretes hormones and enzymes
    Rest of question is incomplete
    4. Plantains in the field
    To improve their investigation: Use random sampling, take more samples.
    With the mean average question, people seemed to be getting either 10,100 or 160,000. Different answers I know but we are not sure which is right.

    Rest of question is incomplete
    5. Polydactyly Question - UPDATED
    Stem cells are undifferentiated stem cells that can potentially become any cell.
    Rest of question is incomplete
    This question had a lot of parts to do with alleles but it was so long no one can really remember it.

    I am not sure if the following answer was on the polydactyly question but here are our redicted answers:Parents genotype: Genotype: mother: Bb father :BbParents phenotype: Both have brown hairGametes: ?Offspring genotype: Brother: bb Sister: BbOffspring phenotype: Brother - red hair sister - brown hair
    6. Removing bacteria from milk with catalase.
    • Advantages: Catalysts can be reused
    • Disadvantages: Enzymes can denature, Hydrogen Peroxide doesn't kill all the bacteria
    These weren't the only ones but they're the ones I have seen posted the most.

    Rest of question is incomplete
    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
    Rest of question is incomplete
    8. Foxes
    How can scientists prove the foxes originated from the same species?
    The scientists could breed 2 of the foxes and see if they produce fertile offspring. (Offspring which can reproduce)
    How are the foxes different species?
    Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
    Why were the foxes on the 3 islands varied 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)
    Know more answers? Please message me on twitter @NacoRBLX, thanks!


    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.

    ................................ ................................ ................................ ................................ ................................ ........
    Grade Boundary Predictions

    These are completely my predictions, we have decided that it was a fairly
    easy paper so our boundaries are fairly high.

    A* - 46 marks

    A - 37 marks

    B - 31 marks

    C - 24 marks




    Thanks for using my mark scheme : )
    a) Plant the pondweed in some soil in a tub and leave it ina dark room. This is to make sure that no other factor affect (such as lightshining from elsewhere) affects the rate of photosynthesis. (I know, pondweedin soil?? Makes no sense but idk why I wrote that) b) Place the lamp in the room at a low intensity for oneweek. c) Using the beaker measure, water the pondweed, however,make sure that you water the plant the same amount each time to ensure thatdifferent levels of water does not affect the rate of photosynthesis.
    I know this answer to the 6 mark question will not get full marks, (if was not finished either) but do you feel it could get any marks at all though, even if its just 1?
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    (Original post by mellowjoker)
    What did everyone get for the genotype, phenotype and gametes question for the mother, father and then children? I couldn't remember what a phenotype was and so I'm pretty sure I completely messed up that page
    I put as the phenotype Bb and Bb and then the Genotype I put heterozygous and gametes I put XY and XX - I'm certain I've got this entire page wrong as it was something I only briefly revised and now wish I had spent more time on!


    Posted from TSR Mobile
    For the parents:

    Genotype is Bb and Bb
    Phenotype is both have brown hair
    Gametes were B b and B b



    Posted from TSR Mobile
    • Thread Starter
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    (Original post by Abid_0805)
    for disadvantage for peoxide one i put its a chemical so it can mix with the milk which could harm humans if we drink it would that get me the marks
    Thanks, I'll add it to the mark scheme.
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    (Original post by WrightKe)
    Why was it Mitosis and not meiosis? It was producing sperm cells?
    No it was the type of cell division that occurs AFTER fertilisation, which is mitosis, embryos divide through mitosis.


    Posted from TSR Mobile
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    (Original post by Bondioz)
    The spec states that humans can develop allergies to certain enzymes, so you could get the mark
    Hopefully haha, but AQA might do the same old thing and be an ars** by being strict on marking -_-
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    (Original post by Bulletzone)
    Drinking Hydrogen Peroxide can cause chemical burns in the esophagus, which can lead to scarring and even narrow it, making it more likely you'll choke.
    Yes there's a 95% chance you shall get the mark.
    Great!
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    (Original post by Naco88)
    Thanks, I'll add it to the mark scheme.
    As a disadvantage for hydrogen peroxide, I used the information the gave us and said: 'hydrogen peroxide does not kill all the disease causing bacteria, so the milk is not completely safe'


    Posted from TSR Mobile
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    (Original post by Charlieskye)
    Thats exactly what i thought!
    Yeah I put that as because they're respiring anaerobically there still needs to be a high amount of oxygen left to break down and oxidise the lactic acid produced just after exercise, so the blood flow needs to remain high meaning he was exercising for 1 minute
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    There was a question where a woman who didn't have polydactyly and a man who did, what is the probability that their offspring will have polydactyly?
    I think that's 50%, due to the dominant gene.
 
 
 
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