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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 Oasis61)
    Wasn't it 50%? Since the man is heterozygous (Dd) and the women in (dd)
    Dd Dd dd dd

    Posted from TSR Mobile
    I think its 50%
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    (Original post by Kesavan2000)
    I'm pretty sure epithelial was 3 and muscle was 2

    Posted from TSR Mobile
    Muscles was 1 epithelial was 1 but glandular was 3
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    Did any one had the full mark schemes for aqa b2 gcse.
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    (Original post by Moustafa123r)
    Muscles was 1 epithelial was 1 but glandular was 3
    Epithelial was 1
    Glandular was 3
    Muscular was 2
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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.
    I have received a ton of answers on Twitter (@NacoRBLX) and have added a lot more to this! Thanks to everyone who has and still is sending me answers! We have made a really good community on this post today and look out for the chemistry and physics threads on Wednesday and Friday! - Naco88This 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 - UPDATED
    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
    c) How does the flow of the blood help the athlete's muscles?
    Removes lactic acid, build up. Causes less fatigue. Supplies oxygen.
    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 :Bb
    Parents phenotype: Both have brown hair
    Gametes: Mother: XY Father: XX
    Offspring genotype: Brother: bb Sister: Bb
    Offspring phenotype: Brother - red hair sister - brown hair

    How do you know the man is heterogeneous?
    He has B & b alleles.
    6. Removing bacteria from milk with catalase.
    • Advantages: Catalysts can be reused
    • Disadvantages: Enzymes can denature, Hydrogen Peroxide doesn't kill all the bacteria, It could mix with/stay in the milk which could be harmful to humans.
    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 : )
    There was a fill the gap question that said what system was the stomach part of. The answer is the digestive system and it was one mark.
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    Is a b3 mark scheme being made?
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    I have completed the whole mark scheme except for 1 question worth 1 mark. I have also put all the mark allocations on. https://docs.google.com/document/d/1...p=docslist_api
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    thanks so much ! btw do you have the B3 one by any chance ???
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    (Original post by Christistina_X)
    thanks so much ! btw do you have the B3 one by any chance ???
    Not yet
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    (Original post by funky2722)
    oh dear, you don't need to put XX XY, they were asking you what gametes the parent would have and it would be B and b for both,
    I first put B then b

    but then I changed it to Bb and Bb
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    (Original post by guy321)
    I first put B then b

    but then I changed it to Bb and Bb
    ohh its only one mark, don't worry
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    I regret not writing testes! I forgot the spelling n I wrote domething else instead, a really bad answer. I feel bad abt my 1mrk! Also I forgot to round metres to cm! N I didn't understand the genes question s!!!
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    I wrote anaerobic respiration was the incomplete breakdown of glucose that releases little energy.. would i still get the mark??

    and for the six marker, I know i did it wrong, but i spoke about using different WATT bulbs (3W 6W and 10W) and then usingthe ruler to measure the growth in plant????????? ((( i did al the control variables like temp and co2 concentraion the same, e.g keep it in a green house, use energy efficient light bulb, do repeats, create a mean, would i get any?
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    The function of Glandular Tissue in the 'stomach' is specifically to make digestive juices to digest food. I doubt anybody will get the marks for not writing this.
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    For the probability question what if I wrote 1/2 instead of 50%??
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    (Original post by partallaboutme)
    I wrote anaerobic respiration was the incomplete breakdown of glucose that releases little energy.. would i still get the mark??

    and for the six marker, I know i did it wrong, but i spoke about using different WATT bulbs (3W 6W and 10W) and then usingthe ruler to measure the growth in plant????????? ((( i did al the control variables like temp and co2 concentraion the same, e.g keep it in a green house, use energy efficient light bulb, do repeats, create a mean, would i get any?
    You will still get the 6 marks because changing the watts of the bulb can also measure the light intensity as the brightness changes. Its just a different method used.
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    You know that question where it asked something like "why dont they use cells from the umbilical cord to treat genetic diseases?' Did anyone else put that these cells would still have the same DNA as the rest of the cells so you cant treat it?
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    For the gland question, I wrote that it secretes hormones and enzymes such as digestive juices to help digestion. Also it produces the protease enzyme then I wrote how it breaks down proteins into fatty acids and glycerol (I don't know why). How many marks? Thanks
    Posted from TSR Mobile
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    (Original post by iLukeAi)
    You know that question where it asked something like "why dont they use cells from the umbilical cord to treat genetic diseases?' Did anyone else put that these cells would still have the same DNA as the rest of the cells so you cant treat it?
    I did , I put it would still contain the diseased allele but I'm not sure if its right


    I put testicles instead of testes, same thing right???
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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.
    I have received a ton of answers on Twitter (@NacoRBLX) and have added a lot more to this! Thanks to everyone who has and still is sending me answers! We have made a really good community on this post today and look out for the chemistry and physics threads on Wednesday and Friday! - Naco88This 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 - UPDATED
    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
    c) How does the flow of the blood help the athlete's muscles?
    Removes lactic acid, build up. Causes less fatigue. Supplies oxygen.
    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 :Bb
    Parents phenotype: Both have brown hair
    Gametes: Mother: XY Father: XX
    Offspring genotype: Brother: bb Sister: Bb
    Offspring phenotype: Brother - red hair sister - brown hair

    How do you know the man is heterogeneous?
    He has B & b alleles.
    6. Removing bacteria from milk with catalase.
    • Advantages: Catalysts can be reused
    • Disadvantages: Enzymes can denature, Hydrogen Peroxide doesn't kill all the bacteria, It could mix with/stay in the milk which could be harmful to humans.
    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 : )
    Thanks so much deeply appreciate it!!!!
 
 
 
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